h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 130

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

Section 3 MCU Operating Modes
3.2.4
STCR is an 8-bit readable/writable register that controls register access, the IIC operating mode
(when the on-chip IIC option is included), an on-chip flash memory control (in F-ZTAT versions),
and also selects the TCNT input clock. For details of functions other than register access control,
see the descriptions of the relevant modules. If a module controlled by STCR is not used, do not
write 1 to the corresponding bit.
STCR is initialized to H'00 by a reset and in hardware standby mode.
Bit 7—Reserved: Do not write 1 to this bit.
Bits 6 and 5—I
bus interface when the on-chip IIC option is included. For details, see section 16.2.7, Serial Timer
Control Register (STCR).
Bit 4—I
and control registers (ICCR, ICSR, ICDR/SARX, and ICMR/SAR), the PWMX data registers and
control registers (DADRAH/DACR, DADRAL, DADRBH/DACNTH, and DADRBL/DACNTL),
and the SCI control registers (SMR, BRR, and SCMR).
Rev. 4.00 Jun 06, 2006 page 76 of 1004
REJ09B0301-0400
Bit
Initial value
Read/Write
2
C Master Enable (IICE): Controls CPU access to the I
Serial Timer Control Register (STCR)
2
C Transfer Select (IICX1, IICX0): These bits control the operation of the I
R/W
—
7
0
IICX1
R/W
6
0
IICX0
R/W
5
0
IICE
R/W
4
0
FLSHE
R/W
3
0
2
C bus interface data registers
R/W
—
2
0
ICKS1
R/W
1
0
ICKS0
R/W
0
0
2
C