M32C8A Datasheet, PDF (219/372 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 Series

M32C/8A Group
17. Serial Interfaces
UARTi Special Mode Register 4 (i = 0 to 4)
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
U0SMR4 to U2SMR4
U3SMR4, U4SMR4
Address
0364h, 02E4h, 0334h
0324h, 02F4h
After Reset
00h
00h
Bit Symbol
Bit Name
Function
RW
STAREQ
Start condition generate bit^{(1, 3)}
0: Clear
1: Start
RW
RSTAREQ
Restart condition generate
bit^{(1, 3)}
0: Clear
1: Start
RW
STPREQ
Stop condition generate bit^{(1, 3)}
0: Clear
1: Start
RW
0: Serial input/output circuit selected
STSPSEL SCL, SDA output select bit⁽¹⁾
1: Start/stop condition generation circuit
RW
selected⁽⁴⁾
ACKD
ACK data bit⁽²⁾
0: ACK
1: NACK
RW
ACKC
ACK data output enable bit⁽²⁾
0: Serial data output
1: ACK data output
RW
When the bus is free,
SCLHI
SCL output stop bit⁽¹⁾
0: SCLi output not stopped
RW
1: SCLi output stopped
SWC9
SCL wait output bit 3⁽¹⁾
0: No wait state/release wait state
1: SCLi pin is held "L" after receiving 9th bit
RW
NOTES:
1. These bits are used when the MCU is in master mode in I ²C mode.
2. These bits are used when the MCU is in slave mode in I ²C mode.
3. When each condition generation is completed, the corresponding bit becomes 0. When a condition generation is failed, the bit
remains as 1.
4. Set the STSPSEL bit to 1 (start/stop condition generation circuit selected) after setting the STAREQ bit, RSTAREQ bit, or
STPREQ bit to 1 (start).
Figure 17.6 U0SMR4 to U4SMR4 Registers
Rev.1.00 Jul 15, 2007 Page 202 of 352
REJ09B0385-0100