M16C80 Datasheet, PDF (167/358 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/80 SERIES

M16C/80 Group
20. UARTi Special Mode Register (i = 2 to 4)
UARTi special mode register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
UiSMR (i=2 to 4)
Address
033716, 032716, 02F716
When reset
0016
Bit
symbol
IICM
Bit
name
I²C mode select bit
Function
(During clock synchronous
serial I/O mode)
0 : Normal mode
1 : I²C mode
Function
(During UART mode)
Set to “0”
RW
ABC
BBS
LSYN
Arbitration lost detecting
flag control bit
Bus busy flag
0 : Update per bit
1 : Update per byte
0 : STOP condition detected
1 : START condition detected
Set to “0”
Set to “0”
SCLL sync output
enable bit
0 : Disabled
1 : Enabled
Set to “0”
(Note 1)
ABSCS ^{Bus collision detect}
Set to “0”
sampling clock select bit
ACSE
SSS
Auto clear function
select bit of transmit
enable bit
Transmit start condition
select bit
Set to “0”
Set to “0”
0 : Rising edge of transfer
clock
(Note 2)
1 : Underflow signal of timer Ai
0 : No auto clear function
1 : Auto clear at occurrence of
bus collision
0 : Ordinary
1 : Falling edge of RxDi
Nothing is assigned.
When write, set "0". When read, the content is "0".
Note 1: Nothing but "0" may be written.
Note 2: UART2 : timer A0 underflow signal, UART3 : timer A3 underflow signal, UART4 : timer A4
underflow signal.
UARTi special mode register 2
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
UiSMR2 (i=2 to 4)
Address
033616, 032616, 02F616
When reset
0016
Bit
symbol
Bit name
IICM2 IIC mode select bit 2
CSC Clock synchronous bit
SWC SCL wait output bit
ALS SDA output stop flag
STC UARTi initialize bit
SWC2 SCL wait output bit 2
SDHI SDA output inhibit bit
SHTC Start/stop condition
control bit
Function
Refer to Table 20.2
0 : Disabled
1 : Enabled
0 : Disabled
1 : Enabled
0 : Disabled
1 : Enabled
0 : Disabled
1 : Enabled
0 : UARTi clock
1 : 0 output
0 : Enabled
1 : Disabled (high impedance)
Set to "1" in selecting IIC mode.
RW
Figure 20.1 UART2 special mode register
Rev.1.00 Aug. 02, 2005 ^{Page 156} of 329
REJ09B0187-0100