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2.2 Interrupts
2-15
4513/4514 Group User’s Manual
Interrupt control register I1 at reset : 00002 at RAM back-up : state retained
R/W
This bit has no function, but read/write is enabled.
Falling waveform (“L” level of INT0 pin is recognized
with the SNZI0 instruction)/“L” level
Rising waveform (“H” level of INT0 pin is recognized
with the SNZI0 instruction)/“H” level
One-sided edge detected
Both edges detected
Disabled
Enabled
Not used
Interrupt valid waveform for INT0
pin/return level selection bit
(Note 2)
INT0 pin edge detection circuit
control bit
INT0 pin
timer 1 control enable bit
0
1
0
1
0
1
0
1
I13
I12
I11
I10
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: When the contents of I12 is changed, the external interrupt request flag EXF0 may be set.
Accordingly, clear EXF0 flag with the SNZ0 instruction.
(5) Interrupt control register I1
The INT0 pin timer 1 control enable bit is assigned to bit 0, INT0 pin edge detection circuit control
bit is assigned to bit 1, and interrupt valid waveform for INT0 pin/return level selection bit is assigned
to bit 2.
Set the contents of this register through register A with the TI1A instruction.
In addition, the TAI1 instruction can be used to transfer the contents of register I1 to register A.
Table 2.2.3 shows the interrupt control register I1.
Table 2.2.3 Interrupt control register I1
(6) Interrupt control register I2
The INT1 pin timer 3 control enable bit is assigned to bit 0, the INT1 pin edge detection circuit control
bit is assigned to bit 1 and the interrupt valid waveform for INT1 pin/return level selection bit is
assigned to bit 2.
Set the contents of this register through register A with the TI2A instruction.
In addition, the TAI2 instruction can be used to transfer the contents of register I2 to register A.
Table 2.2.4 shows the interrupt control register I2.
Table 2.2.4 Interrupt control register I2
Interrupt control register I2 at reset : 00002 at RAM back-up : state retained
R/W
This bit has no function, but read/write is enabled.
Falling waveform (“L” level of INT1 pin is recognized
with the SNZI1 instruction)/“L” level
Rising waveform (“H” level of INT1 pin is recognized
with the SNZI1 instruction)/“H” level
One-sided edge detected
Both edges detected
Disabled
Enabled
Not used
Interrupt valid waveform for INT1
pin/return level selection bit
(Note 2)
INT1 pin edge detection circuit
control bit
INT1 pin
timer 3 control enable bit
0
1
0
1
0
1
0
1
I23
I22
I21
I20
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: When the contents of I22 is changed, the external interrupt request flag EXF1 may be set.
Accordingly, clear EXF1 flag with the SNZ1 instruction.