NAME sdata
?PR?_senddatatoad9851?sdata SEGMENT CODE
;?DT?_senddatatoad9851?sdata SEGMENT DATA OVERLAYABLE 
;?BI?_senddatatoad9851?sdata SEGMENT BIT OVERLAYABLE


PUBLIC _senddatatoad9851



?_senddatatoad9851?BIT: 
      DATA7 BIT P0.7
      FQ_UD BIT P0.6
      W_CLK BIT P0.5

RSEG ?PR?_senddatatoad9851?sdata

;=================================================
;寫頻率數據到AD9851，時鐘三倍頻已經打開，如果晶振是30000000HZ
;則時鐘等于18000000HZ
;R3-R2-R1-R0四個字節，這個32位的數據代表了將輸出頻率值（注意，不是等于）
;單位HZ
;32位的數據=所需輸出的頻率值(HZ)乘以2的32次方得到的積再除以18000000
;-------------------------------------------------
_senddatatoad9851: 
                CLR     FQ_UD
                MOV     A,R7         ;數據低位字節
                LCALL   SEND_PLLRDATA
                MOV     A,R6
                LCALL   SEND_PLLRDATA
                MOV     A,R5
                LCALL   SEND_PLLRDATA
                MOV     A,R4	      ;數據高位字節
                LCALL   SEND_PLLRDATA
                MOV     A,#001B
                LCALL   SEND_PLLRDATA
                SETB    FQ_UD
                CLR     FQ_UD
                RET
;--------------------------------------------------
;==================================================


;==================================================
;--------------------------------------------------
SEND_PLLRDATA:
                MOV     C,ACC.0
                MOV     DATA7,C
                SETB    W_CLK
                CLR     W_CLK
                MOV     C,ACC.1
                MOV     DATA7,C
                SETB    W_CLK
                CLR     W_CLK
                MOV     C,ACC.2
                MOV     DATA7,C
                SETB    W_CLK
                CLR     W_CLK
                MOV     C,ACC.3
                MOV     DATA7,C
                SETB    W_CLK
                CLR     W_CLK
                MOV     C,ACC.4
                MOV     DATA7,C
                SETB    W_CLK
                CLR     W_CLK
                MOV     C,ACC.5
                MOV     DATA7,C
                SETB    W_CLK
                CLR     W_CLK
                MOV     C,ACC.6
                MOV     DATA7,C
                SETB    W_CLK
                CLR     W_CLK
                MOV     C,ACC.7
                MOV     DATA7,C
                SETB    W_CLK
                CLR     W_CLK
                RET
;-------------------------------------
;=====================================
end