Datasheet

Section 15 I
2
C Bus Interface 2 (IIC2)
Rev.5.00 Nov. 02, 2005 Page 234 of 418
REJ09B0028-0500
• I
2
C bus transmit data register (ICDRT)
• I
2
C bus receive data register (ICDRR)
• I
2
C bus shift register (ICDRS)
15.3.1 I
2
C Bus Control Register 1 (ICCR1)
ICCR1 enables or disables the I
2
C bus interface 2, controls transmission or reception, and selects
master or slave mode, transmission or reception, and transfer clock frequency in master mode.
Bit Bit Name
Initial
Value R/W Description
7 ICE 0 R/W I
2
C Bus Interface Enable
0: This module is halted. (SCL and SDA pins are set to port
function.)
1: This bit is enabled for transfer operations. (SCL and SDA
pins are bus drive state.)
6 RCVD 0 R/W Reception Disable
This bit enables or disables the next operation when TRS is
0 and ICDRR is read.
0: Enables next reception
1: Disables next reception
5
4
MST
TRS
0
0
R/W
R/W
Master/Slave Select
Transmit/Receive Select
In master mode with the I
2
C bus format, when arbitration is
lost, MST and TRS are both reset by hardware, causing a
transition to slave receive mode. Modification of the TRS bit
should be made between transfer frames.
After data receive has been started in slave receive mode,
when the first seven bits of the receive data agree with the
slave address that is set to SAR and the eighth bit is 1,
TRS is automatically set to 1. If an overrun error occurs in
master mode with the clock synchronous serial format,
MST is cleared to 0 and slave receive mode is entered.
Operating modes are described below according to MST
and TRS combination. When clocked synchronous serial
format is selected and MST is 1, clock is output.
00: Slave receive mode
01: Slave transmit mode
10: Master receive mode
11: Master transmit mode