HD64F2149 Datasheet, PDF (110/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

3.1.2 Register Configuration
The H8S/2169 or H8S/2149 has 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 MCU Registers
Name
Abbreviation
R/W
Mode control register
MDCR
R/W
System control register
SYSCR
R/W
Bus control register
BCR
R/W
Serial/timer control register STCR
R/W
Note: * Lower 16 bits of the address.
Initial Value
Undetermined
H'09
H'D7
H'00
Address*
H'FFC5
H'FFC4
H'FFC6
H'FFC3
3.2 Register Descriptions
3.2.1 Mode Control Register (MDCR)
Bit
7
6
5
4
3
2
1
0
EXPE
—
—
—
—
—
MDS1 MDS0
Initial value
—*
0
0
0
0
0
—*
—*
Read/Write R/W*
—
—
—
—
—
R
R
Note: * Determined by pins MD1 and MD0.
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.
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