M32C80 Datasheet, PDF (194/352 Pages) Renesas Technology Corp – 16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES

M32C/80 Group
16. Serial I/O
UARTi Special Mode Register 4 (i=0 to 4)
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
U0SMR4 to U4SMR4
Address
036416, 02E416, 033416, 032416, 02F416
After Reset
0016
Bit
Symbol
Bit Name
Function
RW
Start Condition
0: Clear
STAREQ _{Generate Bit(1)}
1: Start
RW
Restart Condition
0: Clear
RSTAREQ _{Generate Bit(1)}
1: Start
RW
Stop Condition
STPREQ _{Generate Bit(1)}
SCL, SDA Output
STSPSEL _{Select Bit}
ACKD ACK Data Bit
0: Clear
1: Start
RW
0: Selects the serial I/O circuit
1: Selects the start/stop condition RW
generation circuit
0: ACK
1: NACK
RW
ACKC
ACK Data Output
Enable Bit
0: Serial I/O data output
1: ACK data output
RW
SCLHI ^{SCL Output Stop}
Enable Bit
0: Disabled
1: Enabled
RW
SWC9 SCL Wait Output Bit 3
0: SCL "L" hold disabled
1: SCL "L" hold enabled
RW
NOTE:
1. When each condition is generated, the STAREQ, RSTAREQ or STPREQ bit is set to "0".
When a condition generation is incomplete, the bit remains unchanged as "1".
Figure 16.8 U0SMR4 to U4SMR4 Registers
Rev. 1.00 Nov. 01, 2005 Page 175 of 330
REJ09B0271-0100