h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 632

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

Section 21 ROM
21.1.2
The H8S/2138 Group and H8S/2134 Group on-chip ROM is controlled by the operating mode and
register MDCR. The register configuration is shown in table 21.1.
Table 21.1 ROM Register
Register Name
Mode control register
Note:
21.2
21.2.1
MDCR is an 8-bit register used to set the H8S/2138 Group or H8S/2134 Group operating mode
and monitor the current operating mode.
The EXPE bit is initialized in accordance with the mode pin states by a reset and in hardware
standby mode.
Bit 7—Expanded Mode Enable (EXPE): Sets expanded mode. In mode 1, EXPE is fixed at 1
and cannot be modified. In modes 2 and 3, EXPE has an initial value of 0 and can be read or
written.
Bit 7
EXPE
0
1
Rev. 4.00 Jun 06, 2006 page 578 of 1004
REJ09B0301-0400
Bit
Initial value
Read/Write
Note: * Determined by the MD1 and MD0 pins.
* Lower 16 bits of the address.
Register Configuration
Register Descriptions
Mode Control Register (MDCR)
Description
Single-chip mode selected
Expanded mode selected
(Mask ROM Version, H8S/2138 F-ZTAT, H8S/2134 F-ZTAT, and H8S/2132 F-ZTAT)
EXPE
R/W *
—*
7
Abbreviation
MDCR
—
—
6
0
—
—
5
0
R/W
R/W
—
—
4
0
Initial Value
Undefined
Depends on the operating mode
—
—
3
0
—
—
2
0
MDS1
—*
R
1
Address *
H'FFC5
MDS0
—*
R
0