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Section 16 I
2
C Bus Interface 2 (IIC2)
Rev. 4.00 Sep. 14, 2005 Page 480 of 982
REJ09B0023-0400
Bit Bit Name
Initial
Value R/W Description
4 SDAOP 1 R/W SDAO Write Protect
This bit controls change of output level of the SDA pin
by modifying the SDAO bit. To change the output level,
clear SDAO and SDAOP to 0 or set SDAO to 1 and
clear SDAOP to 0. This bit is always read as 1.
3 SCLO 1 R This bit monitors SCL output level. When SCLO is 1,
SCL pin outputs high. When SCLO is 0, SCL pin
outputs low.
2 1 Reserved
This bit is always read as 1, and cannot be modified.
1 IICRST 0 R/W IIC Control Part Reset
This bit resets the control part except for I
2
C registers. If
this bit is set to 1 when hang-up occurs because of
communication failure during I
2
C operation, I
2
C control
part can be reset without setting ports and initializing
registers.
0 1 Reserved
This bit is always read as 1, and cannot be modified.
16.3.3 I
2
C Bus Mode Register (ICMR)
ICMR is an 8-bit readable/writable register that selects whether the MSB or LSB is transferred
first, performs master mode wait control, and selects the transfer bit count.
ICMR is initialized to H'38 by a power-on reset.
Bit Bit Name
Initial
Value R/W Description
7 MLS 0 R/W MSB-First/LSB-First Select
0: MSB-first
1: LSB-first
Set this bit to 0 when the I
2
C bus format is used.
6 0 Reserved
The write value should always be 0.