Texas Instruments MSP430x1xx manual 11.Slave Transmitter

I2C Module Operation

Figure 15−11.Slave Transmitter

	IDLE
No
2	START		OAIFG Set If Not
			RESTART
Detected?
	Yes		I2CDR Empty
STTIFG Is Set			I2CDR Loaded?
I2CBUSY Is Set
4 x I2CPSC
I2CBB Is Set			Yes	No
XA = 1		XA = 0	8 x SCL
			Send Data
8 x SCL	8 x SCL
			Low Byte
Receive Slave	Receive Slave		To Master
Address Bits 9−8	Address Bits 6−0
with R/W = 0	with R/W = 1		Ack	No Ack
No	No		8 x SCL
Match	Match		Send Data
	2		High Byte
			To Master
Matched I2COA	Matched I2COA		No Ack	1
1 x SCL	1 x SCL		Ack
			Ack and
Send		Send	I2CWORD=0
Acknowledge	Acknowledge
			STOP Detected?	No
8 x SCL
Receive Slave	No	2
Address Bits 7−0	Match
				RESTART
Matched I2COA			Yes	Detected?
1 x SCL
Send	1 x SCL		4 x I2CPSC
				Yes
Acknowledge		Send	I2CBB Is Cleared
		Acknowledge
OAIFG Set If Not	8 x SCL		13 x I2CPSC
			I2CBUSY Is
RESTART		Receive Slave
				1
		Address Bits 9−8	Cleared
		with R/W=1

2nd Start

Yes STTIFG Is Set

Detected?

IDLE

No	Data	Yes	Enter Slave Receive
	on SDA?		mode at ”1”

No

USART Peripheral Interface, I2C Mode 15-13