h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 966

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Appendix B Internal I/O Registers
ICCR1—I
ICCR0—I
Rev. 4.00 Jun 06, 2006 page 912 of 1004
REJ09B0301-0400
Note: * Only 0 can be written, to clear the flag.
I
2
Bit
Initial value
Read/Write
0
1
C bus interface enable
I
SCL and SDA signal pins set to port
function
Internal state initialization of I
interface module
SAR and SARX can be accessed
I
transfer operations (pins SCL and SCA
are driving the bus)
ICMR and ICDR can be accessed
2
2
C bus interface module disabled, with
C bus interface module enabled for
2
2
C Bus Control Register 1
C Bus Control Register 0
R/W
ICE
7
0
I
enable
2
0
1
C bus interface interrupt
IEIC
R/W
Interrupts disabled
Interrupts enabled
6
0
2
C bus
MST
R/W
5
0
Master/slave select (MST), transmit/receive select (TRS)
Note: For details, see section 16.2.5, I
TRS
R/W
0
1
4
0
0
1
0
1
Acknowledge bit judgement selection
Register (ICCR).
0
1
Slave receive mode
Slave transmit mode
Master receive mode
Master transmit mode
ACKE
Bus busy
The value of the acknowledge bit is ignored,
and continuous transfer is performed
If the acknowledge bit is 1, continuous
transfer is interrupted
H'FF88
H'FFD8
R/W
0
1
3
0
Bus is free
[Clearing condition]
When a stop condition is detected
Bus is busy
[Setting condition]
When a start condition is detected
Note: For the clearing and setting
I
2
0
1
C bus interface interrupt request flag
Start condition/stop condition
prohibit
0
1
Waiting for transfer, or transfer in
progress
Interrupt requested
BBSY
R/W
conditions, see section 16.2.5,
I
2
2
0
C Bus Control Register (ICCR).
Writing 0 issues a start or
stop condition, in combination
with the BBSY flag
Reading always returns a
value of 1; writing is ignored
R/(W) *
IRIC
1
0
2
C Bus Control
SCP
W
0
1
IIC1
IIC0