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Bits 5 and 4: Interrupt control modes 1 and 0 (INTM1, INTM0)
These bits are for selecting the interrupt control mode of the interrupt controller. For details of
the interrupt control modes, see section 6.4, Interrupt Operation.
Bit 5
Bit 4
INTM1
INTM0
Interrupt
Control Mode
Description
0
0
Interrupt is controlled by bit I
(Initial value)
0
1
1
Interrupt is controlled by bits I and UI, and ICR
0
2
Cannot be used in this LSI
1
1
3
Cannot be used in this LSI
Bit 3: External Reset (XRST)
Indicates the reset source. When the watchdog timer is used, a reset can be generated by
watchdog timer overflow as well as by external reset input. XRST is a read-only bit. It is set to
1 by an external reset and cleared to 0 by watchdog timer overflow.
Bit 3
XRST
Description
0
A reset is generated by watchdog timer overflow
1
A reset is generated by an external reset
(Initial value)
Bits 2 and 1: NMI edge select 1 and 0 (NMIG1, 0)
Select the input edge for NMI interrupt.
Bit 2
Bit 1
NIMIEG1
NIMIEG0
Description
0
An interrupt request occurs at falling edge of NMI input
(Initial value)
0
1
An interrupt request occurs at rising edge of NMI input
1
*
An interrupt request occurs at rising or falling edge of NMI input
Note:
*
Don't care
Bit 0: Reserved.
Содержание Hitachi H8S/2191
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