Rev. 6.00, 08/04, page 328 of 628
Bits 1 and 0—Clock Select 1, 0 (CKS1, CKS0)
Bits 1 and 0 choose
φ
/64,
φ
/16,
φ
w/2, or
φ
as the clock source for the baud rate generator.
For the relation between the clock source, bit rate register setting, and baud rate, see section
10.2.8, Bit rate register (BRR).
Bit 1
CKS1
Bit 0
CKS0
Description
0
0
φ
clock
(initial value)
0
1
φ
w/2 clock
*
1
/
φ
w clock
*
2
1
0
φ
/16 clock
1
1
φ
/64 clock
Notes: 1.
φ
w/2 clock in active (medium-speed/high-speed) mode and sleep mode
2.
φ
w clock in subactive mode and subsleep mode. In subactive or subsleep mode, SCI3
can be operated when CPU clock is
φ
w/2 only.
10.2.6
Serial Control Register 3 (SCR3)
Bit
Initial value
Read/Write
7
TIE
0
R/W
6
RIE
0
R/W
5
TE
0
R/W
4
RE
0
R/W
3
MPIE
0
R/W
0
CKE0
0
R/W
2
TEIE
0
R/W
1
CKE1
0
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.
Содержание H8/38024 Series
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