Section 3
MCU Operating Modes
Rev. 1.00 Apr. 28, 2008 Page 69 of 994
REJ09B0452-0100
3.2.2
System Control Register (SYSCR)
SYSCR monitors a reset source, selects the interrupt control mode and the detection edge for
NMI, enables or disables access to the on-chip peripheral module registers, and enables or disables
the on-chip RAM address space.
Bit Bit
Name
Initial
Value R/W
Description
7, 6
—
All 0
R
Reserved
The initial value should not be changed.
5
4
INTM1
INTM0
0
0
R
R/W
Interrupt Control Select Mode 1 and 0
These bits select the interrupt control mode of the
interrupt controller.
For details on the interrupt control modes, see section
5.6, Interrupt Control Modes and Interrupt Operation.
00: Interrupt control mode 0
01: Interrupt control mode 1
10: Setting prohibited
11: Setting prohibited
3 XRST 1
R External
Reset
Indicates the reset source. A reset is caused by an
external reset input, or when the watchdog timer
overflows.
0: A reset is caused when the watchdog timer overflows
1: A reset is caused by an external reset
2
NMIEG
0
R/W
NMI Edge Select
Selects the valid edge of the NMI interrupt input.
0: An interrupt is requested at the falling edge of NMI
input
1: An interrupt is requested at the rising edge of NMI
input
Содержание H8S/2100 Series
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