h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 82

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

3.2
The following registers are related to the operating mode.
• Mode control register (MDCR)
• System control register (SYSCR)
3.2.1
MDCR is used to set an operating mode and to monitor the current operating mode.
Note:
Rev. 2.00, 03/04, page 50 of 534
Bit
7
6 to 3
2
1
0
*
Bit Name
EXPE

MDS2
MDS1

Register Descriptions
Mode Control Register (MDCR)
The initial values are determined by the settings of the MD2 and MD1 pins.
Initial
Value
0
All 0
—*
—*
0
R/W
R/W
R
R
R
R
Description
Extended Mode Enable
Specifies extended mode.
0: Single-chip mode
1: Extended mode
Reserved
These bits are always read as 0 and cannot be
modified.
Mode Select 2, 1
These bits indicate the input levels at mode pins (MD2
and MD1) (the current operating mode). Bits MDS2 and
MDS1 correspond to MD2 and MD1, respectively.
MDS2 and MDS1 are read-only bits and they cannot be
written to. The mode pin (MD2 and MD1) input levels
are latched into these bits when MDCR is read. These
latches are canceled by a reset.
Reserved
This bit is always read as 0 and cannot be modified.