MITSUBISHI MICROCOMPUTERS
3822 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Interrupt request bit
Interrupt enable bit
Interrupt disable flag (I)
Interrupt request
BRK instruction
Reset
Fig. 18 Interrupt control
b7
b0
Interrupt edge selection register
(INTEDGE : address 003A16
)
INT
INT
INT
INT
0
1
2
3
interrupt edge selection bit
interrupt edge selection bit
interrupt edge selection bit
interrupt edge selection bit
0 : Falling edge active
1 : Rising edge active
Not used (return “0” when read)
b7
b0
b7
b0
Interrupt request register 2
Interrupt request register 1
(IREQ2 : address 003D16
)
(IREQ1 : address 003C16
)
INT
INT
0
1
interrupt request bit
interrupt request bit
CNTR
CNTR
0
1
interrupt request bit
interrupt request bit
Serial I/O receive interrupt request bit
Serial I/O transmit interrupt request bit
Timer X interrupt request bit
Timer 1 interrupt request bit
INT
INT
2
interrupt request bit
interrupt request bit
3
Timer Y interrupt request bit
Key input interrupt request bit
Timer 2 interrupt request bit
Timer 3 interrupt request bit
ADT/AD conversion interrupt request bit
Not used (returns “0” when read)
0 : No interrupt request issued
1 : Interrupt request issued
b7
b0
b7
b0
Interrupt control register 1
Interrupt control register 2
(ICON1 : address 003E16
)
(ICON2 : address 003F16
)
INT
INT
0
1
interrupt enable bit
interrupt enable bit
CNTR
CNTR
0
1
interrupt enable bit
interrupt enable bit
Serial I/O receive interrupt enable bit
Serial I/O transmit interrupt enable bit
Timer X interrupt enable bit
Timer 1 interrupt enable bit
INT
INT
2
interrupt enable bit
interrupt enable bit
3
Timer Y interrupt enable bit
Key input interrupt enable bit
Timer 2 interrupt enable bit
Timer 3 interrupt enable bit
ADT/AD conversion interrupt enable bit
Not used (returns “0” when read)
(Do not write “1” to this bit.)
0 : Interrupts disabled
1 : Interrupts enabled
Fig. 19 Structure of interrupt-related registers
23
MITSUBISHI [ Mitsubishi Group ]
