HD6432670 Hitachi, HD6432670 Datasheet - Page 146

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

5.3.7
SSIER selects the ,54 pins used to recover from the software standby state.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
5.4
5.4.1
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
,54 to ,54 . Interrupts IRQ15 to IRQ0 have the following features:
Rev. 2.0, 04/02, page 100 of 906
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 ,54 to ,54 .
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.
Bit Name
SSI15
SSI14
SSI13
SSI12
SSI11
SSI10
SSI9
SSI8
SSI7
SSI6
SSI5
SSI4
SSI3
SSI2
SSI1
SSI0
Software Standby Release IRQ Enable Register (SSIER)
Interrupt Sources
External Interrupts
Initial Value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Software Standby Release IRQ Setting
These bits select the
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)
,54Q
pins used to recover
(n = 15 to 0)