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IIC-BUS INTERFACE S3C2440A RISC MICROPROCESSOR
20-4
DATA TRANSFER FORMAT
Every byte placed on the SDA line should be eight bits in length. The bytes can be unlimitedly transmitted per
transfer. The first byte following a Start condition should have the address field. The address field can be
transmitted by the master when the IIC-bus is operating in Master mode. Each byte should be followed by an
acknowledgement (ACK) bit. The MSB bit of the serial data and addresses are always 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 PDATA(1Byte) A
Read Mode Format with 7-bit Addresses
"1"
(Read)
Data Transferred
(Data + Acknowledge)
S Slave Address 7 bits R/W A PDATA A
Write Mode Format with 10-bit Addresses
"0"
(Write)
Data Transferred
(Data + Acknowledge)
PDATA AS
Slave Address
1st 7 bits
R/W A
Slave Address
2nd Byte
A
11110XX
Read Mode Format with 10-bit Addresses
"1"
(Read)
S
Slave Address
1st 7 bits
11110XX
R/W A
Slave Address
2nd Byte
A rS
Slave Address
1st 7 Bits
A
Data Transferred
(Data + Acknowledge)
PDATA AR/W
"1"
(Read)
Figure 20-3. IIC-Bus Interface Data Format