參數(shù)資料
型號: M30201MX-XXXFP
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
文件頁數(shù): 39/159頁
文件大?。?/td> 1496K
代理商: M30201MX-XXXFP
Unde
Interrupts
deeopmen
Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
39
Saving Registers
In the interrupt sequence, only the contents of the flag register (FLG) and that of the program counter
(PC) are saved in the stack area.
First, the processor saves the 4 high-order bits of the program counter, and 4 high-order bits and 8 low-
order bits of the FLG register, 16 bits in total, in the stack area, then saves 16 low-order bits of the
program counter. Figure 1.27 shows the state of the stack as it was before the acceptance of the interrupt
request, and the state the stack after the acceptance of the interrupt request.
Save other necessary registers at the beginning of the interrupt routine using software. Using the
PUSHM instruction alone can save all the registers except the stack pointer (SP).
Figure 1.27. State of stack before and after acceptance of interrupt request
Address
Content of previous stack
Stack area
[SP]
Stack pointer
value before
interrupt occurs
m
m – 1
m – 2
m – 3
m – 4
Stack status before interrupt request
is acknowledged
Stack status after interrupt request
is acknowledged
Content of previous stack
m + 1
MSB
LSB
m
m – 1
m – 2
m – 3
m – 4
Address
Flag register (FLG
L
)
Content of previous stack
Stack area
Flag register
(FLG
H
)
Program
counter (PC
H
)
[SP]
New stack
pointer value
Content of previous stack
m + 1
MSB
LSB
Program counter (PC
L
)
Program counter (PC
M
)
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