Datasheet

Table Of Contents
Section 3 MCU Operating Modes
Page 64 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
3.2 Register Descriptions
The following registers are related to the operating mode.
Mode control register (MDCR)
System control register (SYSCR)
3.2.1 Mode Control Register (MDCR)
MDCR is used to monitor the current operating mode of this LSI.
Bit Bit Name Initial Value R/W Description
7 — 1 Reserved
This bit is always read as 1 and cannot be modified.
6 to 3 All 0 Reserved
These bits are always read as 0 and cannot be
modified.
2
1
0
MDS2
MDS1
MDS0
*
*
*
R
R
R
Mode select 2 to 0
These bits indicate the input levels at pins MD2 to
MD0 (the current operating mode).Bits MDS2 to
MDS0 correspond to MD2 to MD0. MDS2 to MDS0
are read-only bits and they cannot be written to. The
mode pin (MD2 to MD0) input levels are latched into
these bits when MDCR is read.
These latches are canceled by a power-on reset, but
maintained at manual reset.
Note: * Determined by the MD2 to MD0 pin settings.
3.2.2 System Control Register (SYSCR)
SYSCR is used to select the interrupt control mode and the detected edge for NMI, select the
MRES input pin enable or disable, and enables or disables on-chip RAM.