參數(shù)資料
型號： M30100
廠商： Renesas Technology Corp.
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)： 44/164頁
文件大?。?/td> 3302K
代理商： M30100
deveopment
Tentative Specifications REV.E1
Interrupts
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M30100/M30102 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
43
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:
Example 1:
INT_SWITCH1:
FCLR
AND.B
NOP
NOP
FSET
I
#00h, 0055h
; Disable interrupts.
; Clear T1IC int. priority level and int. request bit.
;
I
; Enable interrupts.
Example 2:
INT_SWITCH2:
FCLR
AND.B
MOV.W
FSET
I
#00h, 0055h
MEM, R0
I
; Disable interrupts.
; Clear T1IC int. priority level and int. request bit.
; Dummy read.
; Enable interrupts.
Example 3:
INT_SWITCH3:
PUSHC
FCLR
AND.B
POPC
FLG
I
#00h, 0055h
FLG
; Push Flag register onto stack
; Disable interrupts.
; Clear T1IC int. priority level and int. request bit.
; Enable interrupts.
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.
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 gener-
ated. This will depend on the instruction. If this creates problems, use the below instructions to change
the register.
Instructions : AND, OR, BCLR, BSET
Changing the interrupt request bit
When attempting to clear the interrupt request bit of an interrupt control register, the interrupt request bit
is not cleared sometimes. This will depend on the instruction. If this creates problems, use the below
instructions to change the register.
Instructions : MOV
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