Software Standby Release Irq Enable Register (Ssier); Interrupt Sources; External Interrupts - Hitachi H8S/2378, H8S/2378R Series Hardware Manual

5.3.7

Software Standby Release IRQ Enable Register (SSIER)

SSIER selects the ,54 pins used to recover from the software standby state.
Bit Bit Name
15 SSI15
14 SSI14
13 SSI13
12 SSI12
11 SSI11
10 SSI10
9 SSI9
8 SSI8
7 SSI7
6 SSI6
5 SSI5
4 SSI4
3 SSI3
2 SSI2
1 SSI1
0 SSI0
5.4

Interrupt Sources

5.4.1

External Interrupts

There are seventeen external interrupts: NMI and IRQ15 to IRQ0. These interrupts can be used to
restore the chip from software standby mode.
NMI Interrupt: Nonmaskable interrupt request (NMI) is the highest-priority interrupt, and is
always accepted by the CPU regardless of the interrupt control mode or the status of the CPU
interrupt mask bits. The NMIEG bit in INTCR can be used to select whether an interrupt is
requested at a rising edge or a falling edge on the NMI pin.
IRQ15 to IRQ0 Interrupts: Interrupts IRQ15 to IRQ0 are requested by an input signal at pins
,5448 to ,543. Interrupts IRQ15 to IRQ0 have the following features:
• Using ISCR, it is possible to select whether an interrupt is generated by a low level, falling
edge, rising edge, or both edges, at pins ,5448 to ,543.
• Enabling or disabling of interrupt requests IRQ15 to IRQ0 can be selected with IER.
• The interrupt priority level can be set with IPR.
• The status of interrupt requests IRQ15 to IRQ0 is indicated in ISR. ISR flags can be cleared to
0 by software.
Rev. 1.0, 09/01, page 88 of 904
Initial Value R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
Description
Software Standby Release IRQ Setting
These bits select the ,54Q pins used to recover
from the software standby state.
0: IRQn requests are not sampled in the
software standby state (Initial value when n =
15 to 3)
1: When an IRQn request occurs in the software
standby state, the chip recovers from the
software standby state after the elapse of the
oscillation settling time (Initial value when n = 2
to 0)
(n = 15 to 0)