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M16C/62P Group (M16C/62P, M16C/62PT)
______
12.7 NMI Interrupt
_______
An NMI interrupt request is generated when input on the NMI pin changes state from high to low. The NMI
interrupt is a non-maskable interrupt.
The input level of this NMI interrupt input pin can be read by accessing the P8_5 bit in the P8 register.
This pin cannot be used as an input port.
12.8 Key Input Interrupt
Of P10_4 to P10_7, a key input interrupt is generated when input on any of the P10_4 to P10_7 pins which
has had the PD10_4 to PD10_7 bits in the PD10 register set to "0" (= input) goes low. Key input interrupts
can be used as a key-on wake up function, the function which gets the microcomputer out of wait or stop
mode. However, if you intend to use the key input interrupt, do not use P10_4 to P10_7 as analog input
ports. Figure 12.11 shows the block diagram of the key input interrupt. Note, however, that while input on
any pin which has had the PD10_4 to PD10_7 bits set to "0" (= input mode) is pulled low, inputs on all other
pins of the port are not detected as interrupts.
Pull-up
transistor
KI3
Pull-up
transistor
KI2
Pull-up
transistor
KI1
Pull-up
transistor
KI0
Figure 12.11 Key Input Interrupt
R
e
. v
2
3 .
0
S
e
p
0
, 1
2
0
0
4
R
E
J
0
9
B
0
1
8
5
0 -
2
3
0
Z
_______
PU25 bit in PUR2 register
PD10_7 bit in PD10 register
PD10_7 bit in
PD10 register
PD10_6 bit in
PD10 register
PD10_5 bit in
PD10 register
PD10_4 bit in
PD10 register
f o
3
6
4
page 104
_______
KUPIC register
Interrupt control circuit
12. Interrupt
______
Key input interrupt
request
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