
HARDWARE
1-22
7540 Group User’s Manual
Fig. 19 Interrupt control
Fig. 20 Structure of Interrupt-related registers
Interrupt disable flag I
Interrupt request
Interrupt request bit
Interrupt enable bit
BRK instruction
Reset
b7
b0
b7
b0
b7
b0
Interrupt edge selection register
INT0 interrupt edge selection bit
0 : Falling edge active
1 : Rising edge active
INT1 interrupt edge selection bit
0 : Falling edge active
1 : Rising edge active
Not used (returns “0” when read)
P00 key-on wakeup enable bit
0 : Key-on wakeup enabled
1 : Key-on wakeup disabled
(INTEDGE : address 003A16, initial value : 0016)
Interrupt request register 1
Serial I/O1 receive interrupt request bit
Serial I/O1 transmit interrupt request bit
INT0 interrupt request bit
INT1 interrupt request bit
Key-on wake up interrupt request bit
CNTR0 interrupt request bit
CNTR1 interrupt request bit
Timer X interrupt request bit
0 : No interrupt request issued
1 : Interrupt request issued
(IREQ1 : address 003C16, initial value : 0016)
b7
b0 Interrupt control register 1
Serial I/O1 receive interrupt enable bit
Serial I/O1 transmit interrupt enable bit
INT0 interrupt enable bit
INT1 interrupt enable bit (Do not write “1” to this bit for 32-pin version)
Key-on wake up interrupt enable bit
CNTR0 interrupt enable bit
CNTR1 interrupt enable bit
Timer X interrupt enable bit
0 : Interrupts disabled
1 : Interrupts enabled
(ICON1 : address 003E16, initial value : 0016)
Interrupt request register 2
Timer Y interrupt request bit
Timer Z interrupt request bit
Timer A interrupt request bit
Serial I/O2 interrupt request bit
A-D conversion interrupt request bit
Timer 1 interrupt request bit
Not used (returns “0” when read)
0 : No interrupt request issued
1 : Interrupt request issued
(IREQ2 : address 003D16, initial value : 0016)
b7
b0 Interrupt control register 2
Timer Y interrupt enable bit
Timer Z interrupt enable bit
Timer A interrupt enable bit
Serial I/O2 interrupt enable bit
A-D conversion interrupt enable bit
Timer 1 interrupt enable bit
Not used (returns “0” when read)
(Do not write “1” to this bit)
0 : Interrupts disabled
1 : Interrupts enabled
(ICON2 : address 003F16, initial value : 0016)
FUNCTIONAL DESCRIPTION