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Bits 1 and 0: Clock select 1, 0 (CKS1, CKS0)
Bits 1 and 0 choose ø/64, ø/16, øw/2, or ø as the clock source for the baud rate generator.
For the relation between the clock source, bit rate register setting, and baud rate, see 8, Bit rate
register (BRR).
Bit 1
Bit 0
CKS1
CKS0
0
0
0
1
1
0
1
1
Notes: 1. ø w/2 clock in active (medium-speed/high-speed) mode and sleep mode
2. ø w clock in subactive mode and subsleep mode
3. In subactive or subsleep mode, SCI3 can be operated when CPU clock is øw/2 only.
10.2.6
Serial control register 3 (SCR3)
Bit
TIE
Initial value
Read/Write
R/W
SCR3 is an 8-bit register for selecting transmit or receive operation, the asynchronous mode clock
output, interrupt request enabling or disabling, and the transmit/receive clock source.
SCR3 can be read or written by the CPU at any time.
SCR3 is initialized to H'00 upon reset, and in standby, module standby or watch mode.
256
Description
ø clock
*1
ø w/2 clock
/ø w clock
ø/16 clock
ø/64 clock
7
6
5
RIE
TE
0
0
0
R/W
R/W
*2
4
3
RE
MPIE
0
0
R/W
R/W
(initial value)
2
1
TEIE
CKE1
CKE0
0
0
R/W
R/W
R/W
0
0
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