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參數(shù)資料
| 型號： | M30621MCM-XXXGP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單片16位CMOS微機(jī) |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 594K |
| 代理商： | M30621MCM-XXXGP |
Usage precaution
Mitsubishi microcomputers
M16C / 62M (80-pin version) Group
(Low voltage version)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
18
(4) External interrupt
When the polarity of the INT0 to INT2 pins is changed, the interrupt request bit is sometimes set
to "1". After changing the polarity, set the interrupt request bit to "0".
Example 1:
INT_SWITCH1:
FCLR
AND.B
NOP
NOP
FSET
I
#00h, 0055h
; Disable interrupts.
; Clear TA0IC int. priority level and int. request bit.
I
; Enable interrupts.
Example 2:
INT_SWITCH2:
FCLR
AND.B
MOV.W MEM, R0
FSET
I
#00h, 0055h
; Disable interrupts.
; Clear TA0IC int. priority level and int. request bit.
; Dummy read.
; Enable interrupts.
I
Example 3:
INT_SWITCH3:
PUSHC FLG
FCLR
AND.B
POPC
; Push Flag register onto stack
; Disable interrupts.
; Clear TA0IC int. priority level and int. request bit.
; Enable interrupts.
I
#00h, 0055h
FLG
The reason why two NOP instructions or dummy read are inserted before FSET I in Examples 1 and 2 is
to prevent the interrupt enable flag I from being set before the interrupt control register is rewritten due to
effects of the instruction queue.
(5) Rewrite the interrupt control register
To rewrite the interrupt control register, do so at a point that does not generate the interrupt
request for that register. If there is possibility of the interrupt request occur, rewrite the interrupt
control register after the interrupt is disabled. The program examples are described as follow:
When a instruction to rewrite the interrupt control register is executed but the interrupt is disabled,
the interrupt request bit is not set sometimes even if the interrupt request for that register has
been generated. This will depend on the instruction. If this creates problems, use the below
instructions to change the register.
Instructions : AND, OR, BCLR, BSET
Noise
(1) Insert bypass capacitor between V
CC
and V
SS
pin for noise and latch up countermeasure.
Insert bypass capacitor (about 0.1
μ
F) and connect short and wide line between V
CC
and V
SS
lines.
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