Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Manual de usuario descargar pdf (Pagina 131)

MAXQ Family User’s Guide:

MAXQ2010 Supplement

22-8

22.2.3 I

C Example 3: Slave Mode Receive

; I2C 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 ; If address match bit not set, not for us, else:

move I2CIE.2, #01h ; Enable Receive Ready Interrupt

call wait_rxbuf ; Wait for a receive interrupt

;; Byte received in I2CBUF, clear I2C interrupt flag and wait for next interrupt

22.2.4 I

C Example 4: Slave Mode Receive

; I2C 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

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Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Manual de usuario Pagina 131

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