HD643303x Hitachi, HD643303x Datasheet - Page 332

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

11.2.5 Serial Mode Register (SMR)
SMR is an 8-bit register that specifies the SCI serial communication format and selects the clock
source for the baud rate generator.
The CPU can always read and write SMR. SMR is initialized to H'00 by a reset and in standby
mode.
Bit
Initial value
Read/Write
Communication mode
Selects asynchronous or synchronous mode
R/W
C/A
7
0
Character length
Selects character length in asynchronous mode
CHR
R/W
6
0
Parity enable
Selects whether a parity bit is added
R/W
PE
5
0
317
Parity mode
Selects even or odd parity
R/W
O/E
4
0
STOP
Stop bit length
Selects the stop bit length
R/W
3
0
Multiprocessor mode
Selects the multiprocessor
function
R/W
MP
2
0
Clock select 1/0
These bits select the
baud rate generator’s
clock source
CKS1
R/W
1
0
CKS0
R/W
0
0