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參數(shù)資料
| 型號： | AN1759 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Add a Non-Volatile Clock to the MC68HC705J1A |
| 中文描述： | 添加非易失時鐘的MC68HC705J1A |
| 文件頁數(shù)： | 22/24頁 |
| 文件大?。?/td> | 316K |
| 代理商： | AN1759 |
Application Note
AN1759
22
*** Read Time, store away in HC05 time buffer for verification
* Write starting address
jsr
START_SER
;start serial transmission
lda
jsr
lda
jsr
#DS1307_WRITE
TXD
#SECONDS
TXD
;address the DS1307 device, write
;start address of DS1307 read
jsr
STOP_SER
;stop serial transmission
* Read Time data put in HC05 buffer
jsr
START_SER
;start serial transmission
lda
jsr
jsr
sta
jsr
sta
jsr
sta
jsr
sta
jsr
sta
jsr
sta
jsr
sta
#DS1307_READ
TXD
RXD
BUF_SECOND
RXD
BUF_MINUTES
RXD
BUF_HOURS
RXD
BUF_DAY
RXD
BUF_DATE
RXD
BUF_MONTH
RXD_LAST
BUF_YEAR
;address the DS1307 device, read
;read seconds, store to buffer
;read minutes, store to buffer
;read hours, store to buffer
;read the day, store to buffer
;read the date, store to buffer
;read the month, store to buffer
;read the year, store to buffer
jsr
STOP_SER
;stop serial transmission
DUMMY
bra
DUMMY
;test sequence is over
*** SUBROUTINES ********************************************************************
*** Sends out Start command on bus
START_SER
bclr
SDA,SER_PORT
bclr
SCL,SER_PORT
rts
;SDA=0
;SCL=0
*** Sends out Stop command on bus
STOP_SER
bset
bset
rts
SCL,SER_PORT
SDA,SER_PORT
;SCL=1
;SDA=1
*** Routine takes contents of AccA and transmits it serially to
*** the DS1307, MSB first
*** Looks for ACK, goes to ERROR routine if no ACK
TXD
ldx
#8T
;set counter
WRITE
asla
bcc
bset
bra
bclr
brn
;Carry bit = MSB
J1
SDA,SER_PORT
CLOCK_IT
SDA,SER_PORT
J1
;SDA=1
;branch to clock_it
;SDA=0
;evens it out
J1
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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