US_TTGR         #  4 ;- Transmitter Time-guard Register
                # 20 ;- Reserved
US_FIDI         #  4 ;- FI_DI_Ratio Register
US_NER          #  4 ;- Nb Errors Register
                #  4 ;- Reserved
US_IF           #  4 ;- IRDA_FILTER Register
                # 176 ;- Reserved
US_RPR          #  4 ;- Receive Pointer Register
US_RCR          #  4 ;- Receive Counter Register
US_TPR          #  4 ;- Transmit Pointer Register
US_TCR          #  4 ;- Transmit Counter Register
US_RNPR         #  4 ;- Receive Next Pointer Register
US_RNCR         #  4 ;- Receive Next Counter Register
US_TNPR         #  4 ;- Transmit Next Pointer Register
US_TNCR         #  4 ;- Transmit Next Counter Register
US_PTCR         #  4 ;- PDC Transfer Control Register
US_PTSR         #  4 ;- PDC Transfer Status Register
;- -------- US_CR : (USART Offset: 0x0) Debug Unit Control Register -------- 
AT91C_US_STTBRK           EQU (0x1:SHL:9) ;- (USART) Start Break
AT91C_US_STPBRK           EQU (0x1:SHL:10) ;- (USART) Stop Break
AT91C_US_STTTO            EQU (0x1:SHL:11) ;- (USART) Start Time-out
AT91C_US_SENDA            EQU (0x1:SHL:12) ;- (USART) Send Address
AT91C_US_RSTIT            EQU (0x1:SHL:13) ;- (USART) Reset Iterations
AT91C_US_RSTNACK          EQU (0x1:SHL:14) ;- (USART) Reset Non Acknowledge
AT91C_US_RETTO            EQU (0x1:SHL:15) ;- (USART) Rearm Time-out
AT91C_US_DTREN            EQU (0x1:SHL:16) ;- (USART) Data Terminal ready Enable
AT91C_US_DTRDIS           EQU (0x1:SHL:17) ;- (USART) Data Terminal ready Disable
AT91C_US_RTSEN            EQU (0x1:SHL:18) ;- (USART) Request to Send enable
AT91C_US_RTSDIS           EQU (0x1:SHL:19) ;- (USART) Request to Send Disable
;- -------- US_MR : (USART Offset: 0x4) Debug Unit Mode Register -------- 
AT91C_US_USMODE           EQU (0xF:SHL:0) ;- (USART) Usart mode
AT91C_US_USMODE_NORMAL    EQU (0x0) ;- (USART) Normal
AT91C_US_USMODE_RS485     EQU (0x1) ;- (USART) RS485
AT91C_US_USMODE_HWHSH     EQU (0x2) ;- (USART) Hardware Handshaking
AT91C_US_USMODE_MODEM     EQU (0x3) ;- (USART) Modem
AT91C_US_USMODE_ISO7816_0 EQU (0x4) ;- (USART) ISO7816 protocol: T = 0
AT91C_US_USMODE_ISO7816_1 EQU (0x6) ;- (USART) ISO7816 protocol: T = 1
AT91C_US_USMODE_IRDA      EQU (0x8) ;- (USART) IrDA
AT91C_US_USMODE_SWHSH     EQU (0xC) ;- (USART) Software Handshaking
AT91C_US_CLKS             EQU (0x3:SHL:4) ;- (USART) Clock Selection (Baud Rate generator Input Clock
AT91C_US_CLKS_CLOCK       EQU (0x0:SHL:4) ;- (USART) Clock
AT91C_US_CLKS_FDIV1       EQU (0x1:SHL:4) ;- (USART) fdiv1
AT91C_US_CLKS_SLOW        EQU (0x2:SHL:4) ;- (USART) slow_clock (ARM)
AT91C_US_CLKS_EXT         EQU (0x3:SHL:4) ;- (USART) External (SCK)
AT91C_US_CHRL             EQU (0x3:SHL:6) ;- (USART) Clock Selection (Baud Rate generator Input Clock
AT91C_US_CHRL_5_BITS      EQU (0x0:SHL:6) ;- (USART) Character Length: 5 bits
AT91C_US_CHRL_6_BITS      EQU (0x1:SHL:6) ;- (USART) Character Length: 6 bits
AT91C_US_CHRL_7_BITS      EQU (0x2:SHL:6) ;- (USART) Character Length: 7 bits
AT91C_US_CHRL_8_BITS      EQU (0x3:SHL:6) ;- (USART) Character Length: 8 bits
AT91C_US_SYNC             EQU (0x1:SHL:8) ;- (USART) Synchronous Mode Select
AT91C_US_NBSTOP           EQU (0x3:SHL:12) ;- (USART) Number of Stop bits
AT91C_US_NBSTOP_1_BIT     EQU (0x0:SHL:12) ;- (USART) 1 stop bit
AT91C_US_NBSTOP_15_BIT    EQU (0x1:SHL:12) ;- (USART) Asynchronous (SYNC=0) 2 stop bits Synchronous (SYNC=1) 2 stop bits
AT91C_US_NBSTOP_2_BIT     EQU (0x2:SHL:12) ;- (USART) 2 stop bits
AT91C_US_MSBF             EQU (0x1:SHL:16) ;- (USART) Bit Order
AT91C_US_MODE9            EQU (0x1:SHL:17) ;- (USART) 9-bit Character length
AT91C_US_CKLO             EQU (0x1:SHL:18) ;- (USART) Clock Output Select
AT91C_US_OVER             EQU (0x1:SHL:19) ;- (USART) Over Sampling Mode
AT91C_US_INACK            EQU (0x1:SHL:20) ;- (USART) Inhibit Non Acknowledge
AT91C_US_DSNACK           EQU (0x1:SHL:21) ;- (USART) Disable Successive NACK
AT91C_US_MAX_ITER         EQU (0x1:SHL:24) ;- (USART) Number of Repetitions
AT91C_US_FILTER           EQU (0x1:SHL:28) ;- (USART) Receive Line Filter
;- -------- US_IER : (USART Offset: 0x8) Debug Unit Interrupt Enable Register -------- 
AT91C_US_RXBRK            EQU (0x1:SHL:2) ;- (USART) Break Received/End of Break
AT91C_US_TIMEOUT          EQU (0x1:SHL:8) ;- (USART) Receiver Time-out
AT91C_US_ITERATION        EQU (0x1:SHL:10) ;- (USART) Max number of Repetitions Reached
AT91C_US_NACK             EQU (0x1:SHL:13) ;- (USART) Non Acknowledge
AT91C_US_RIIC             EQU (0x1:SHL:16) ;- (USART) Ring INdicator Input Change Flag
AT91C_US_DSRIC            EQU (0x1:SHL:17) ;- (USART) Data Set Ready Input Change Flag
AT91C_US_DCDIC            EQU (0x1:SHL:18) ;- (USART) Data Carrier Flag
AT91C_US_CTSIC            EQU (0x1:SHL:19) ;- (USART) Clear To Send Input Change Flag
;- -------- US_IDR : (USART Offset: 0xc) Debug Unit Interrupt Disable Register -------- 
;- -------- US_IMR : (USART Offset: 0x10) Debug Unit Interrupt Mask Register -------- 
;- -------- US_CSR : (USART Offset: 0x14) Debug Unit Channel Status Register -------- 
AT91C_US_RI               EQU (0x1:SHL:20) ;- (USART) Image of RI Input
AT91C_US_DSR              EQU (0x1:SHL:21) ;- (USART) Image of DSR Input
AT91C_US_DCD              EQU (0x1:SHL:22) ;- (USART) Image of DCD Input
AT91C_US_CTS              EQU (0x1:SHL:23) ;- (USART) Image of CTS Input

;- *****************************************************************************
;-              SOFTWARE API DEFINITION  FOR Synchronous Serial Controller Interface
;- *****************************************************************************
                ^ 0 ;- AT91S_SSC
SSC_CR          #  4 ;- Control Register
SSC_CMR         #  4 ;- Clock Mode Register
                #  8 ;- Reserved
SSC_RCMR        #  4 ;- Receive Clock ModeRegister
SSC_RFMR        #  4 ;- Receive Frame Mode Register
SSC_TCMR        #  4 ;- Transmit Clock Mode Register
SSC_TFMR        #  4 ;- Transmit Frame Mode Register
SSC_RHR         #  4 ;- Receive Holding Register
SSC_THR         #  4 ;- Transmit Holding Register
                #  8 ;- Reserved
SSC_RSHR        #  4 ;- Receive Sync Holding Register
SSC_TSHR        #  4 ;- Transmit Sync Holding Register
                #  8 ;- Reserved
SSC_SR          #  4 ;- Status Register
SSC_IER         #  4 ;- Interrupt Enable Register
SSC_IDR         #  4 ;- Interrupt Disable Register
SSC_IMR         #  4 ;- Interrupt Mask Register
                # 176 ;- Reserved
SSC_RPR         #  4 ;- Receive Pointer Register
SSC_RCR         #  4 ;- Receive Counter Register
SSC_TPR         #  4 ;- Transmit Pointer Register
SSC_TCR         #  4 ;- Transmit Counter Register
SSC_RNPR        #  4 ;- Receive Next Pointer Register
SSC_RNCR        #  4 ;- Receive Next Counter Register
SSC_TNPR        #  4 ;- Transmit Next Pointer Register
SSC_TNCR        #  4 ;- Transmit Next Counter Register
SSC_PTCR        #  4 ;- PDC Transfer Control Register
SSC_PTSR        #  4 ;- PDC Transfer Status Register
;- -------- SSC_CR : (SSC Offset: 0x0) SSC Control Register -------- 
AT91C_SSC_RXEN            EQU (0x1:SHL:0) ;- (SSC) Receive Enable
AT91C_SSC_RXDIS           EQU (0x1:SHL:1) ;- (SSC) Receive Disable
AT91C_SSC_TXEN            EQU (0x1:SHL:8) ;- (SSC) Transmit Enable
AT91C_SSC_TXDIS           EQU (0x1:SHL:9) ;- (SSC) Transmit Disable
AT91C_SSC_SWRST           EQU (0x1:SHL:15) ;- (SSC) Software Reset
;- -------- SSC_RCMR : (SSC Offset: 0x10) SSC Receive Clock Mode Register -------- 
AT91C_SSC_CKS             EQU (0x3:SHL:0) ;- (SSC) Receive/Transmit Clock Selection
AT91C_SSC_CKS_DIV         EQU (0x0) ;- (SSC) Divided Clock
AT91C_SSC_CKS_TK          EQU (0x1) ;- (SSC) TK Clock signal
AT91C_SSC_CKS_RK          EQU (0x2) ;- (SSC) RK pin
AT91C_SSC_CKO             EQU (0x7:SHL:2) ;- (SSC) Receive/Transmit Clock Output Mode Selection
AT91C_SSC_CKO_NONE        EQU (0x0:SHL:2) ;- (SSC) Receive/Transmit Clock Output Mode: None RK pin: Input-only
AT91C_SSC_CKO_CONTINOUS   EQU (0x1:SHL:2) ;- (SSC) Continuous Receive/Transmit Clock RK pin: Output
AT91C_SSC_CKO_DATA_TX     EQU (0x2:SHL:2) ;- (SSC) Receive/Transmit Clock only during data transfers RK pin: Output
AT91C_SSC_CKI             EQU (0x1:SHL:5) ;- (SSC) Receive/Transmit Clock Inversion
AT91C_SSC_CKG             EQU (0x3:SHL:6) ;- (SSC) Receive/Transmit Clock Gating Selection
AT91C_SSC_CKG_NONE        EQU (0x0:SHL:6) ;- (SSC) Receive/Transmit Clock Gating: None, continuous clock
AT91C_SSC_CKG_LOW         EQU (0x1:SHL:6) ;- (SSC) Receive/Transmit Clock enabled only if RF Low
AT91C_SSC_CKG_HIGH        EQU (0x2:SHL:6) ;- (SSC) Receive/Transmit Clock enabled only if RF High
AT91C_SSC_START           EQU (0xF:SHL:8) ;- (SSC) Receive/Transmit Start Selection
AT91C_SSC_START_CONTINOUS EQU (0x0:SHL:8) ;- (SSC) Continuous, as soon as the receiver is enabled, and immediately after the end of transfer of the previous data.
AT91C_SSC_START_TX        EQU (0x1:SHL:8) ;- (SSC) Transmit/Receive start
AT91C_SSC_START_LOW_RF    EQU (0x2:SHL:8) ;- (SSC) Detection of a low level on RF input
AT91C_SSC_START_HIGH_RF   EQU (0x3:SHL:8) ;- (SSC) Detection of a high level on RF input
AT91C_SSC_START_FALL_RF   EQU (0x4:SHL:8) ;- (SSC) Detection of a falling edge on RF input
AT91C_SSC_START_RISE_RF   EQU (0x5:SHL:8) ;- (SSC) Detection of a rising edge on RF input
AT91C_SSC_START_LEVEL_RF  EQU (0x6:SHL:8) ;- (SSC) Detection of any level change on RF input
AT91C_SSC_START_EDGE_RF   EQU (0x7:SHL:8) ;- (SSC) Detection of any edge on RF input
AT91C_SSC_START_0         EQU (0x8:SHL:8) ;- (SSC) Compare 0
AT91C_SSC_STOP            EQU (0x1:SHL:12) ;- (SSC) Receive Stop Selection
AT91C_SSC_STTDLY          EQU (0xFF:SHL:16) ;- (SSC) Receive/Transmit Start Delay
AT91C_SSC_PERIOD          EQU (0xFF:SHL:24) ;- (SSC) Receive/Transmit Period Divider Selection
;- -------- SSC_RFMR : (SSC Offset: 0x14) SSC Receive Frame Mode Register -------- 
AT91C_SSC_DATLEN          EQU (0x1F:SHL:0) ;- (SSC) Data Length
AT91C_SSC_LOOP            EQU (0x1:SHL:5) ;- (SSC) Loop Mode
AT91C_SSC_MSBF            EQU (0x1:SHL:7) ;- (SSC) Most Significant Bit First
AT91C_SSC_DATNB           EQU (0xF:SHL:8) ;- (SSC) Data Number per Frame
AT91C_SSC_FSLEN           EQU (0xF:SHL:16) ;- (SSC) Receive/Transmit Frame Sync length
AT91C_SSC_FSOS            EQU (0x7:SHL:20) ;- (SSC) Receive/Transmit Frame Sync Output Selection
AT91C_SSC_FSOS_NONE       EQU (0x0:SHL:20) ;- (SSC) Selected Receive/Transmit Frame Sync Signal: None RK pin Input-only
AT91C_SSC_FSOS_NEGATIVE   EQU (0x1:SHL:20) ;- (SSC) Selected Receive/Transmit Frame Sync Signal: Negative Pulse
AT91C_SSC_FSOS_POSITIVE   EQU (0x2:SHL:20) ;- (SSC) Selected Receive/Transmit Frame Sync Signal: Positive Pulse
AT91C_SSC_FSOS_LOW        EQU (0x3:SHL:20) ;- (SSC) Selected Receive/Transmit Frame Sync Signal: Driver Low during data transfer
AT91C_SSC_FSOS_HIGH       EQU (0x4:SHL:20) ;- (SSC) Selected Receive/Transmit Frame Sync Signal: Driver High during data transfer
AT91C_SSC_FSOS_TOGGLE     EQU (0x5:SHL:20) ;- (SSC) Selected Receive/Transmit Frame Sync Signal: Toggling at each start of data transfer
AT91C_SSC_FSEDGE          EQU (0x1:SHL:24) ;- (SSC) Frame Sync Edge Detection
;- -------- SSC_TCMR : (SSC Offset: 0x18) SSC Transmit Clock Mode Register -------- 
;- -------- SSC_TFMR : (SSC Offset: 0x1c) SSC Transmit Frame Mode Register -------- 
AT91C_SSC_DATDEF          EQU (0x1:SHL:5) ;- (SSC) Data Default Value
AT91C_SSC_FSDEN           EQU (0x1:SHL:23) ;- (SSC) Frame Sync Data Enable
;- -------- SSC_SR : (SSC Offset: 0x40) SSC Status Register -------- 
AT91C_SSC_TXRDY           EQU (0x1:SHL:0) ;- (SSC) Transmit Ready
AT91C_SSC_TXEMPTY         EQU (0x1:SHL:1) ;- (SSC) Transmit Empty
AT91C_SSC_ENDTX           EQU (0x1:SHL:2) ;- (SSC) End Of Transmission
AT91C_SSC_TXBUFE          EQU (0x1:SHL:3) ;- (SSC) Transmit Buffer Empty
AT91C_SSC_RXRDY           EQU (0x1:SHL:4) ;- (SSC) Receive Ready
AT91C_SSC_OVRUN           EQU (0x1:SHL:5) ;- (SSC) Receive Overrun
AT91C_SSC_ENDRX           EQU (0x1:SHL:6) ;- (SSC) End of Reception
AT91C_SSC_RXBUFF          EQU (0x1:SHL:7) ;- (SSC) Receive Buffer Full
AT91C_SSC_CP0             EQU (0x1:SHL:8) ;- (SSC) Compare 0
AT91C_SSC_CP1             EQU (0x1:SHL:9) ;- (SSC) Compare 1
AT91C_SSC_TXSYN           EQU (0x1:SHL:10) ;- (SSC) Transmit Sync
AT91C_SSC_RXSYN           EQU (0x1:SHL:11) ;- (SSC) Receive Sync
AT91C_SSC_TXENA           EQU (0x1:SHL:16) ;- (SSC) Transmit Enable
AT91C_SSC_RXENA           EQU (0x1:SHL:17) ;- (SSC) Receive Enable
;- -------- SSC_IER : (SSC Offset: 0x44) SSC Interrupt Enable Register -------- 
;- -------- SSC_IDR : (SSC Offset: 0x48) SSC Interrupt Disable Register -------- 
;- -------- SSC_IMR : (SSC Offset: 0x4c) SSC Interrupt Mask Register -------- 

;- *****************************************************************************
;-              SOFTWARE API DEFINITION  FOR Two-wire Interface
;- *****************************************************************************
                ^ 0 ;- AT91S_TWI
TWI_CR          #  4 ;- Control Register
TWI_MMR         #  4 ;- Master Mode Register
                #  4 ;- Reserved
TWI_IADR        #  4 ;- Internal Address Register
TWI_CWGR        #  4 ;- Clock Waveform Generator Register
                # 12 ;- Reserved
TWI_SR          #  4 ;- Status Register
TWI_IER         #  4 ;- Interrupt Enable Register
TWI_IDR         #  4 ;- Interrupt Disable Register
TWI_IMR         #  4 ;- Interrupt Mask Register
TWI_RHR         #  4 ;- Receive Holding Register