r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 108

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 3 MCU Operating Modes
3.2
The following registers are related to operating mode setting.
•
•
3.2.1
MDCR monitors the current operating mode of this LSI.
Note:
3.2.2
SYSCR selects saturation operation for the MAC instruction, controls CPU access to the flash
memory control registers, sets the external bus mode, and enables or disables on-chip RAM.
Rev. 1.00 Sep. 19, 2008 Page 80 of 1270
REJ09B0466-0100
Bit
7 to 3
2
1
0
Mode control register (MDCR)
System control register (SYSCR)
*
Register Descriptions
Mode Control Register (MDCR)
System Control Register (SYSCR)
Bit Name

MDS2
MDS1
MDS0
Determined by the settings of pins MD2 to MD0.
Initial Value
All 0
*
*
*
R/W

R
R
R
Descriptions
Reserved
These bits are always read as 0 and cannot be
modified.
Mode Select 2 to 0
These bits indicate the input levels at mode pins
MD2 to MD0 (the current operating mode). Bits
MDS2 to MDS0 correspond to pins MD2 to MD0,
respectively. These bits are read-only bits and so
they cannot be modified. The input levels of the
MD2 to MD0 pins are latched into these bits when
MDCR is read. These latches are canceled by a
reset.