h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 83

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

3.2.2
SYSCR monitors a reset source, selects the interrupt control mode and the detection edge for
NMI, and controls on-chip RAM address space.
Bit
7, 6
5
4
3
2
1
0
Bit Name

INTM1
INTM0
XRST
NMIEG

RAME
System Control Register (SYSCR)
1
0
Initial
Value
All 0
0
0
0
1
R/W
R/W
R
R/W
R
R/W
R/W
R/W
Description
Reserved
The initial value should not be changed.
These bits select the 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
External Reset
This bit 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
1: A reset is caused by an external reset.
NMI Edge Select
Selects the valid edge of the NMI interrupt input.
0: An interrupt is requested at the falling edge of NMI
1: An interrupt is requested at the rising edge of NMI
Reserved
The initial value should not be changed.
RAM Enable
Enables or disables on-chip RAM. The RAME bit is
initialized when the reset state is released.
0: On-chip RAM is disabled
1: On-chip RAM is enabled
overflows.
input
input
Rev. 2.00, 03/04, page 51 of 534