3069RF-ZTAT Datasheet, PDF (482/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

13.2.5 Serial Mode Register (SMR)
SMR is an 8-bit register that specifies the SCI's serial communication format and selects the clock
source for the baud rate generator.
Bit
Initial value
Read/Write
7
6
5
C/)
CHR
PE
0
0
0
R/W R/W R/W
4
3
2
O/- STOP MP
0
0
0
R/W
R/W R/W
1
CKS1
0
R/W
0
CKS0
0
R/W
Clock select 1/0
These bits select the
baud rate generator's
clock source
Multiprocessor mode
Selects the multiprocessor
function
Stop bit length
Selects the stop bit length
Parity mode
Selects even or odd parity
Parity enable
Enables or disables the addition of a parity bit
Character length
Selects character length in asynchronous mode
Communication mode
Selects asynchronous or synchronous mode
The CPU can always read and write SMR. SMR is initialized to H'00 by a reset and in standby
mode.
Bit 7—Communication Mode (C/A)/GSM Mode (GM): The function of this bit differs for the
normal serial communication interface and for the smart card interface. Its function is switched
with the SMIF bit in SCMR.
Rev. 5.0, 09/04, page 460 of 978