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3874 Group User’s Manual
HARDWARE
FUNCTIONAL DESCRIPTION
Fig. 22 Structure of interrupt-related registers
b7
b0
b7
b0
b7
b0
b7
b0
b7
b0
b7
b0
b7
b0
b7
b0
b7
b0
Interrupt edge selection register
INT0 active edge selection bit
INT1 active edge selection bit
INT2 active edge selection bit
INT3 active edge selection bit
INT4 active edge selection bit
INT5 active edge selection bit
Not used (returns “0” when read)
(INTEDGE : address 003A16)
Interrupt request register 1
INT0 interrupt request bit
INT1 interrupt request bit
Receive bus interrupt request bit
Transmit bus interrupt request bit
Timer X interrupt request bit
Timer Y interrupt request bit
Timer 2 interrupt request bit
Timer 3 interrupt request bit
Interrupt control register 1
INT0 interrupt enable bit
INT1 interrupt enable bit
Receive bus interrupt enable bit
Transmit bus interrupt enable bit
Timer X interrupt enable bit
Timer Y interrupt enable bit
Timer 2 interrupt enable bit
Timer 3 interrupt enable bit
0 : No interrupt request issued
1 : Interrupt request issued
(IREQ1 : address 003C16)
(ICON1 : address 003E16)
Interrupt request register 2
INT2 interrupt request bit
CNTR0, serial I/O3 interrupt request bit
CNTR1 interrupt request bit
Timer 1 interrupt request bit
INT3, INT4, INT5 interrupt request bit
ADT/A-D converter, serial I/O2 interrupt
request bit
Key input, serial I/O1 receive, serial
I/O1 transmit interrupt request bit
Not used (returns “0” when read)
(IREQ2 : address 003D16)
Interrupt control register 2
INT2 interrupt enable bit
CNTR0, serial I/O3 interrupt enable bit
CNTR1 interrupt enable bit
Timer 1 interrupt enable bit
INT3, INT4, INT5 interrupt enable bit
ADT/A-D converter, serial I/O2 interrupt
enable bit
Key input, serial I/O1 receive, serial
I/O1 transmit 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)
0 : Falling edge active
1 : Rising edge active
Interrupt source discrimination register 1
INT3 interrupt request bit
INT4 interrupt request bit
INT5 interrupt request bit
Serial I/O1 receive interrupt
request bit
Serial I/O1 transmit interrupt
request bit
Key input interrupt request bit
Serial I/O2 interrupt request bit
ATD/A-D converter interrupt
request bit
0 : No interrupt request issued
1 : Interrupt request issued
(IREQD1 : address 003816)
Interrupt source discrimination control register 1
INT3 interrupt enable bit
INT4 interrupt enable bit
INT5 interrupt enable bit
Serial I/O1 receive interrupt enable
bit
Serial I/O1 transmit interrupt enable
bit
Key input interrupt enable bit
Serial I/O2 interrupt enable bit
ADT/A-D converter interrupt enable
bit
0 : Interrupt disabled
1 : Interrupt enabled
(ICOND1 : address 003916)
Interrupt source discrimination register 2
CNTR0 interrupt request bit
Serial I/O3 interrupt request bit
Not used (returns “0” when read)
0 : No interrupt request issued
1 : Interrupt request issued
(IREQD2 : address 003616)
Interrupt source discrimination control register 2
CNTR0 interrupt enable bit
Serial I/O3 interrupt enable bit
Not used (return “0” when read)
0 : Interrupt disabled
1 : Interrupt enabled
(ICOND2 : address 003716)
0 : No interrupt request issued
1 : Interrupt request issued
0 : Interrupts disabled
1 : Interrupts enabled