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Rev.1.02 Jul 01, 2005 page 73 of 314
REJ09B0126-0102
M16C/6N Group (M16C/6NL, M16C/6NN) 9. Interrupt
Under development
This document is under development and its contents are subject to change.
______
9.7 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.
9.8 Key Input Interrupt
Of P10_4 to P10_7, a key input interrupt request 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 9.14 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.
Interrupt control circuit
KUPIC register
Key input interrupt
request
KI3
KI2
KI1
KI0
PU25 bit in PUR2 register
PD10_7 bit in PD10 register
Pull-up
transistor
PD10_7 bit in PD10 register
PD10_6 bit in
PD10 register
PD10_5 bit in
PD10 register
PD10_4 bit in
PD10 register
Pull-up
transistor
Pull-up
transistor
Pull-up
transistor
Figure 9.14 Key Input Interrupt Block Diagram
9.9 CAN0 Wake-up Interrupt
CAN0 wake-up interrupt request is generated when a falling edge is input to CRX0. The CAN0 wake-up
interrupt is enabled only when the PortEn bit = 1 (CTX/CRX function) and Sleep bit = 1 (Sleep mode
enabled) in the C0CTLR register. Figure 9.15 shows the block diagram of the CAN0 wake-up interrupt.
Please note that the wake-up message will be lost.
Figure 9.15 CAN0 Wake-up Interrupt Block Diagram
PortEn bit in C0CTLR register
Sleep bit in C0CTLR register
CRX0
Interrupt control
circuit
C01WKIC register
CAN0 wake-up
interrupt request