Application Note

Code Listing

AN1759

21

*** RAM VARIABLES ******************************************************************

* Buffer for test reading data from the DS1307

ORG

RAM

BUF_SECONDS

DB

1

;buffer on HC05 for seconds

BUF_MINUTES

DB

1

;buffer on HC05 for hours

BUF_DAY

DB

1

;buffer on HC05 for the day

BUF_DATE

DB

1

;buffer on HC05 for the date

BUF_MONTH

DB

1

;buffer on HC05 for the month

BUF_YEAR

DB

1

;buffer on HC05 for the year

*** MAIN ROUTINE *******************************************************************

ORG

EPROM

;start at begining of EPROM

*** Intialize Ports

START

lda

#$03

;init SER_PORT

sta

SER_PORT

lda

#$03

;make SER_PORT pins outputs

sta

DDRA

*** DS1307 configuration

*** Turn on osc, turn on SQW/OUT pin with 1 Hz signal

jsr

START_SER

;start serial transmission

lda

#DS1307_WRITE

;address the DS1307 device, write

jsr

TXD

lda

#CONTROL

;send address of control reg

jsr

TXD

lda

#$10

;send config data

jsr

TXD

jsr

STOP_SER

;stop serial transmission

*** Write Starting Time to DS1307

jsr

START_SER

;start serial transmission

lda

#DS1307_WRITE

;address the DS1307 device, write

jsr

TXD

lda

#SECONDS

;start address of DS1307

jsr

TXD

lda

#START_SECONDS

;write seconds

jsr

TXD

lda

#START_MINUTES

;write minutes

jsr

TXD

lda

#START_HOURS

;write hours

jsr

TXD

lda

#START_DAY

;write day

jsr

TXD

lda

#START_DATE

;write date

jsr

TXD

lda

#START_MONTH

;write month

jsr

TXD

lda

#START_YEAR

;write year

jsr

TXD

jsr

STOP_SER

;stop serial transmission

Freescale Semiconductor, Inc.

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