M37544G Mitsubishi Electric, M37544G Datasheet - Page 8

• Manufacturer Part Number: M37544G
• Description: Single-Chip 8-Bit CMOS Microcomputer
• Manufacturer: Mitsubishi Electric

Fig. 8 Register push and pop at interrupt generation and subroutine call
Table 3 Push and pop instructions of accumulator or processor status register
8
Accumulator
Processor status register
Store Return Address
on Stack
Restore Return
Address
Note : The condition to enable the interrupt
M (S)
M (S)
(PC
(PC
Execute RTS
Subroutine
(S)
(S)
(S)
(S)
Interrupt request
L
H
)
) M (S)
(PC
(S – 1)
(S – 1)
(S + 1)
(S + 1)
(PC
M (S)
H
L
(Note)
)
)
Push instruction to stack
On-going Routine
Execute JSR
PHA
PHP
Interrupt enable bit is “1”
Interrupt disable flag is “0”
Service Routine
M (S)
(PC
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M (S)
(PC
M (S)
(PS)
Execute RTI
(S)
(S)
(S)
(S)
(S)
(S)
Interrupt
H
L
)
) M (S)
(S – 1)
(S – 1)
(S – 1)
(S + 1)
(S + 1)
(S + 1)
(PC
(PC
M (S)
(PS)
M (S)
MITSUBISHI MICROCOMPUTERS
H
L
)
)
Pop instruction from stack
Store Return Address
on Stack
Store Contents of Processor
Status Register on Stack
Restore Contents of
Processor Status Register
Restore Return
Address
I Flag “0” to “1”
Fetch the Jump Vector
PLA
PLP
7544 Group