4 i2c example: slave mode, transmit, 11 .5 .4 i, C example: slave mode, transmit -15 – Maxim Integrated MAXQ622 User Manual
Page 170: C example: slave mode, transmit
MAXQ612/MAXQ622 User’s Guide
Maxim Integrated
11-15
11.5.4 I
2
C Example: Slave Mode, Transmit
I
2
C configured as slave with address 1Ah:
; Setup for Slave Mode Receive
move I2CSLA, #01ah
; I2C Slave Address = 01ah
move I2CCN, #0001h
; I2CEN = 1, I2CMST = 0, I2CMODE = 0, I2CSTART = 0
call wait_start
; Polling routine to wait for I2CSTART to be set, indicating
;
a
received
START
;; Check for address match
move ACC, I2CST
and #0020h
; Check for Address Match flag set
cmp #0020h
jump ne, no_match
; Not an address match
move ACC, I2CCN
; Check transfer mode is set
and #004h
cmp #004h
jump ne, not_sl_xmit
; If transfer mode is low, not a slave transmit, else:
move I2CBUF, #0aah
; Data byte to be transmitted
call wait_xmit
; Poll for transmit done
;; Verify ACK received from master
move ACC, I2CST
and #080h
cmp #000h
jump ne, FAIL
; If NACK bit set, handle retransmission, else continue