
HARDWARE
1.11 Interrupts
7470/7471/7477/7478 GROUP USER’S MANUAL
1-60
(2) Interrupt request register 1 (IR1: Address 00FC16)
Interrupt request register 2 (IR2: Address 00FD16)
The Interrupt request register 1 and the Interrupt request register 2 consist of bits that indicate
whether an interrupt request exists or not.
Figure 1.11.9 shows a structure of the Interrupt request register 1 and Figure 1.11.10 shows a
structure of the Interrupt request register 2.
Fig. 1.11.9 Structure of Interrupt request register 1
Fig. 1.11.10 Structure of Interrupt request register 2
b7 b6 b5 b4 b3 b2 b1 b0
Interrupt request register 1 (IR1) [Address
B
Name
Function
At reset RW
Interrupt request register 1
0
0 : No interrupt request
1 : Interrupt requested
0
V
Timer 1 interrupt
request bit
1
Timer 2 interrupt
request bit
0
2
Timer 3 interrupt
request bit
0
3
Timer 4 interrupt
request bit
0
4
Serial I/O receive interrupt
request bit
(7477/7478 group)(Note)
?
50
0 : No interrupt request
1 : Interrupt requested
0 : No interrupt request
1 : Interrupt requested
0 : No interrupt request
1 : Interrupt requested
0 : No interrupt request
1 : Interrupt requested
V
!
V
Nothing is allocated for this bit. This is write
disabled bit and is undefined at reading.
Note:
V
:
6
0
7
A-D conversion completion
interrupt request bit
0
0 : No interrupt request
1 : Interrupt requested
0 : No interrupt request
1 : Interrupt requested
V
Serial I/O transmit
interrupt request bit
(7477/7478 group)
In the 7470/7471group, nothing is allocated for bit 5. This is write
disabled bit and is undefined at reading.
“0” is set by software, but not “1.”
Serial I/O interrupt request
bit (7470/7471group)
00FC16]
?
b7 b6 b5 b4 b3 b2 b1 b0
Interrupt request register 2 (IR2) [Address
B
Name
Function
At reset RW
Interrupt request register 2
0
0 : No interrupt request
1 : Interrupt requested
0
V
INT0 interrupt request
bit
1
INT1 interrupt request
bit
0
2
CNTR0 or CNTR1
interrupt request bit
0
3
to
7
V
:
?
0 : No interrupt request
1 : Interrupt requested
0 : No interrupt request
1 : Interrupt requested
V
!
Nothing is allocated for these bits. There are write
disabled bits and are undefined at reading.
“0” is set by software, but not “1.”
?
00FD16]