h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 126

• 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
3.1.2
The H8S/2138 Group and H8S/2134 Group have a mode control register (MDCR) that indicates
the inputs at the mode pins (MD1 and MD0), a system control register (SYSCR) and bus control
register (BCR) that control the operation of the MCU, and a serial timer control register (STCR)
that controls the operation of the supporting modules. Table 3.2 summarizes these registers.
Table 3.2
Name
Mode control register
System control register
Bus control register
Serial timer control register
Note:
3.2
3.2.1
MDCR is an 8-bit read-only register that indicates the operating mode setting and the current
operating mode of the MCU.
The EXPE bit is initialized in coordination with the mode pin states by a reset and in hardware
standby mode.
Rev. 4.00 Jun 06, 2006 page 72 of 1004
REJ09B0301-0400
Bit
Initial value
Read/Write
Note: * Determined by pins MD1 and MD0.
* Lower 16 bits of the address.
Register Configuration
Register Descriptions
Mode Control Register (MDCR)
MCU Registers
EXPE
R/W *
—*
7
Abbreviation
MDCR
SYSCR
BCR
STCR
—
—
6
0
—
—
5
0
R/W
R/W
R/W
R/W
R/W
—
—
4
0
—
—
3
0
Initial Value
Undetermined
H'09
H'D7
H'00
—
—
2
0
MDS1
—*
R
1
Address *
H'FFC5
H'FFC4
H'FFC6
H'FFC3
MDS0
—*
R
0