TMP92CM22 2007-02-16 92CM22-173
3.10.2 Control
The following registers are used to control the serial bus interface and monitor the
operation status.
• Serial bus interface 0 control register 1 (SBI0CR1)
• Serial bus interface 0 control register 2 (SBI0CR2)
• Serial bus interface 0 data buffer register (SBI0DBR)
• I2C bus 0 address register (I2C0AR)
• Serial bus interface 0 status register (SBI0SR)
• Serial bus interface 0 baud rate register 0 (SBI0BR0)
• Serial bus interface 0 baud rate register 1 (SBI0BR1)
The above registers differ depending on a mode to be used.
Refer to Section 3.10.4 “I2C Bus Mode Control Register” and 3.10.7 “Clocked-synchronous
8-Bit SIO Mode Control”.
3.10.3 Data Format in I2C Bus Mode
Data format in I2C bus mode is shown Figure 3.10.3.
(a) Addressing format
(b) Addressing format (with restart)
(c) Free data format (transfer format transfer from master device to slave device)
S: Start condition
R/W: Direction bit
ACK: Acknowledge bit
P: Stop condition
Figure 3.10.2 Data Format in I2C Bus Mode
S Slave address Data
A
C
K
A
C
KSSlave address Data
A
C
K
A
C
KP
8 bits 1 1 to 8bits 18bits 11 to 8 bits 1
1 1 or more 11 or more
R
/
W
R
/
W
8 bits
S Slave address A
C
K
A
C
K
A
C
KP
1 1 to 8 bits 11 to 8 bits 1
1 1 or more
R
/
WData Data
1
1
S Slave address Data
A
C
K
A
C
KData A
C
KP
8 bits 11 to 8 bits 1 to 8 bits
1 1 or more
A
C
K