h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 451

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Bits 1 and 0—Clock Select 1 and 0 (CKS1, CKS0): These bits select the clock source for the
baud rate generator. The clock source can be selected from , /4, /16, and /64, according to the
setting of bits CKS1 and CKS0.
For the relation between the clock source, the bit rate register setting, and the baud rate, see
section 15.2.8, Bit Rate Register.
15.2.6
SCR is a register that performs enabling or disabling of SCI transfer operations, serial clock output
in asynchronous mode, and interrupt requests, and selection of the serial clock source.
SCR can be read or written to by the CPU at all times.
SCR is initialized to H'00 by a reset, and in standby mode, watch mode, subactive mode, subsleep
mode, and module stop mode.
Bit 1
CKS1
0
1
Bit
Initial value
Read/Write
Serial Control Register (SCR)
Bit 0
CKS0
0
1
0
1
R/W
TIE
7
0
Description
/4 clock
/16 clock
/64 clock
clock
R/W
RIE
6
0
R/W
TE
5
0
Section 15 Serial Communication Interface (SCI, IrDA)
R/W
RE
4
0
Rev. 4.00 Jun 06, 2006 page 397 of 1004
MPIE
R/W
3
0
TEIE
R/W
2
0
CKE1
R/W
REJ09B0301-0400
1
0
(Initial value)
CKE0
R/W
0
0