參數(shù)資料
型號(hào): MC68HLC705KJ1CDW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDSO16
封裝: SOIC-16
文件頁數(shù): 68/117頁
文件大?。?/td> 1644K
代理商: MC68HLC705KJ1CDW
External Interrupt Module (IRQ)
Data Sheet
MC68HC705KJ1MC68HRC705KJ1MC68HLC705KJ1 — Rev. 4.0
54
External Interrupt Module (IRQ)
MOTOROLA
Figure 5-1. IRQ Module Block Diagram
5.3.1 IRQ/VPP Pin
An interrupt signal on the IRQ/VPP pin latches an external interrupt request. The
LEVEL bit in the mask option register provides negative edge-sensitive triggering
or both negative edge-sensitive and low level-sensitive triggering for the interrupt
function.
If edge- and level-sensitive triggering is selected, a falling edge or a low level on the
IRQ/VPP pin latches an external interrupt request. Edge- and level-sensitive
triggering allows the use of multiple wired-OR external interrupt sources. An
external interrupt request is latched as long as any source is holding the IRQ/VPP
pin low.
If level-sensitive triggering is selected, the IRQ/VPP input requires an external
resistor to VDD for wired-OR operation. If the IRQ/VPP pin is not used, it must be
tied to the VDD supply.
PIRQ
LEVEL-SENSITIVE TRIGGER
PA3
PA2
PA1
IRQ
PA0
VDD
(MOR LEVEL BIT)
RESET
IRQ VECTOR FETCH
EXTERNAL
INTERRUPT
REQUEST
(MOR)
TO BIH & BIL
INSTRUCTION
PROCESSING
IRQF
IRQR
IRQE
DQ
CK
IRQ
CLR
LATCH
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
$000A
IRQ Status and Control
Register (ISCR)
Read:
IRQE
0
IRQF
000
Write:
R
IRQR
Reset:
10
0
0000
= Unimplemented
R
= Reserved
Figure 5-2. IRQ Module I/O Register Summary
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