參數(shù)資料
型號： M30302MA-XXXGP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, MICROCONTROLLER, PQFP100
封裝： 14 X 14 MM, PLASTIC, QFP-100
文件頁數(shù)： 138/177頁
文件大?。?/td> 2355K
代理商： M30302MA-XXXGP
Precautions for Interrupts
63
Mitsubishi microcomputers
M16C / 30 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Example 1:
INT_SWITCH1:
FCLR
I
; Disable interrupts.
AND.B
#00h, 0055h
; Clear TA0IC int. priority level and int. request bit.
NOP
; Four NOP instructions are required when using HOLD function.
NOP
FSET
I
; Enable interrupts.
Example 2:
INT_SWITCH2:
FCLR
I
; Disable interrupts.
AND.B
#00h, 0055h
; Clear TA0IC int. priority level and int. request bit.
MOV.W MEM, R0
; Dummy read.
FSET
I
; Enable interrupts.
Example 3:
INT_SWITCH3:
PUSHC FLG
; Push Flag register onto stack
FCLR
I
; Disable interrupts.
AND.B
#00h, 0055h
; Clear TA0IC int. priority level and int. request bit.
POPC
FLG
; Enable interrupts.
The reason why two NOP instructions (four when using the HOLD function) 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 changing an interrupt control register in a sate of interrupts being disabled, please read the
following precautions on instructions used before changing the register.
Changing a non-interrupt request bit
If an interrupt request for an interrupt control register is generated during an instruction to rewrite the
register is being executed, there is a case that the interrupt request bit is not set and consequently the
interrupt is ignored. This will depend on the instruction. If this creates problems, use the below instruc-
tions 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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M30302MC 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
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M30302MCL-XXXGP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M30302MCP-XXX 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
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