Samsung S5PC110, Manual

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S5PC110_UM 2 IIC-BUS INTERFACE
2-4
2.3.2 DATA TRANSFER FORMAT
Every byte placed on the SDA line should be eight bits in length. There is no limit to transmit bytes per transfer.
The first byte following a Start condition should have the address field. If the I
2
C-bus is operating in Master mode,
master transmits the address field. Each byte should be followed by an acknowledgement (ACK) bit. The MSB bit
of the serial data and addresses are sent first.
NOTES:
1. S: Start, rS: Repeat Start, P: Stop, A: Acknowledge
2. : From Master to Slave, : From Slave to Master
Write Mode Format with 7-bit Addresses
"0"
(Write)
Data Transferred
(Data + Acknowledge)
S Slave Address 7bits R/W A P DATA(1Byte) A
Read Mode Format with 7-bit Addresses
"1"
(Read)
Data Transferred
(Data + Acknowledge)
S Slave Address 7 bits R/W A P DATA A
Figure 2-3 I
2
C-Bus Interface Data Format
SDA
Acknowledgement
Signal from Receiver
SCL
S
1 2 7 8 9 1 2 9
Acknowledgement
Signal from Receiver
MSB
ACK
Byte Complete, Interrupt
within Receiver
Clock Line Held Low by
receiver and/or transmitter
Figure 2-4 Data Transfer on the I
2
C-Bus