參數(shù)資料
型號: MC68HC08LT8
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 108/156頁
文件大?。?/td> 1030K
代理商: MC68HC08LT8
External Interrupt (IRQ)
MC68HC08LT8 Data Sheet, Rev. 1
108
Freescale Semiconductor
The vector fetch or software clear may occur before or after the interrupt pin returns to logic one. As long
as the pin is low, the interrupt request remains pending. A reset will clear the latch and the MODE control
bit, thereby clearing the interrupt even if the pin stays low.
When set, the IMASK bit in the INTSCR mask all external interrupt requests. A latched interrupt request
is not presented to the interrupt priority logic unless the IMASK bit is clear.
NOTE
The interrupt mask (I) in the condition code register (CCR) masks all
interrupt requests, including external interrupt requests. (See
4.5 Exception
Control
.)
Figure 10-1. IRQ Module Block Diagram
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
$001E
IRQ Status and Control
Register
(INTSCR)
Read:
0
0
0
0
IRQF
0
IMASK
MODE
Write:
ACK
Reset:
0
0
0
0
0
0
0
0
=Unimplemented
Figure 10-2. IRQ I/O Register Summary
IMASK
D
Q
CK
CLR
IRQ
INTERRUPT
REQUEST
HIGH
VOLTAGE
DETECT
TO MODE
SELECT
LOGIC
V
DD
MODE
IRQF
TO CPU FOR
BIL/BIH
INSTRUCTIONS
VECTOR
FETCH
DECODER
I
RESET
ACK
IRQ
SYNCHRONIZER
INTERNAL
PULLUP
DEVICE
V
DD
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