Maxim-integrated MAXQ Family Users Guide: MAXQ8913 Supplement Manual de usuario descargar pdf (Pagina 94)

MAXQ Family User’s Guide:

MAXQ8913 Supplement

22-8

22.2.2 I

C Example 2: Master Mode Receive

; I2C configured as master, receive from slave address 08h:

; Setup for Master Mode Receive

move I2CCN, #047h ; I2CEN = 1, I2CMST = 1, I2CMODE = 1, I2CSTART = 1

call wait_start ; Polling routine to wait for I2CSTART to clear

call wait_busy ; Polling routine to wait for I2CBUSY to clear

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

move I2CBUF, #008h ; Slave address set to 08h

call wait_tx_complete ; Wait for transmit interrupt

call wait_rxbuf ; Wait for receive interrupt

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

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

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Maxim-integrated MAXQ Family Users Guide: MAXQ8913 Supplement Manual de usuario Pagina 94