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| 型號(hào)： | MC80C0224 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 8位單晶片微控制器 |
| 文件頁(yè)數(shù)： | 96/128頁(yè) |
| 文件大小： | 1408K |
| 代理商： | MC80C0224 |
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MC80F0208/16/24
Preliminary
92
MAR. 2005 Ver 0.2
Example:
During Timer1 interrupt is in progress, INT0 interrupt
serviced without any suspend.
TIMER1: PUSH
A
X
Y
IENH,#80H
IENL,#0
PUSH
PUSH
LDM
LDM
EI
:
:
;
Enable INT0 only
;
Disable other int.
;
Enable Interrupt
:
:
:
:
LDM
LDM
POP
POP
POP
RETI
IENH,#0FFH
IENL,#0FFH
Y
X
A
;
Enable all interrupts
19.5 External Interrupt
The external interrupt on INT0, INT1, INT2 and INT3 pins are
edge triggered depending on the edge selection register IEDS (ad-
dress 0EE
H
) as shown in Figure 19-8.
The edge detection of external interrupt has three transition acti-
vated mode: rising edge, falling edge, and both edge.
Figure 19-8 External Interrupt Block Diagram
INT0 ~ INT3 are multiplexed with general I/O ports (R10, R11,
R12, R50). To use as an external interrupt pin, the bit of port se-
lection register PSR0 should be set to “1” correspondingly.
Example:
To use as an INT0 and INT2
:
;
**** Set external interrupt port as pull-up state.
LDM
PU1,#0000_0101B
;
;
**** Set port as an external interrupt port
LDM
PSR0,#0000_0101B
;
;
**** Set Falling-edge Detection
LDM
IEDS,#0001_0001B
:
Response Time
The INT0 ~ INT3 edge are latched into INT0IF ~ INT3IF at every
machine cycle. The values are not actually polled by the circuitry
until the next machine cycle. If a request is active and conditions
are right for it to be acknowledged, a hardware subroutine call to
the requested service routine will be the next instruction to be ex-
ecuted. The DIV itself takes twelve cycles. Thus, a minimum of
twelve complete machine cycles elapse between activation of an
external interrupt request and the beginning of execution of the
first instruction of the service routine.
Figure 19-9 shows interrupt response timings.
INT0IF
INT0 pin
INT0 INTERRUPT
INT1IF
INT1 pin
INT1 INTERRUPT
INT2IF
INT2 pin
INT2 INTERRUPT
IEDS
[0EEH]
INT3IF
INT3 pin
INT3 INTERRUPT
Edge selection
Register
2
2
2
2
01
10
11
01
10
11
01
10
11
01
10
11
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