M16C6NK Datasheet, PDF (116/404 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

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M16C/6N Group (M16C/6NK, M16C/6NM)
10. Interrupt
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10.7 NMI Interrupt
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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.
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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.
10.8 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 10.14 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.
Pull-up
transistor
KI3
Pull-up
transistor
KI2
Pull-up
transistor
KI1
Pull-up
transistor
KI0
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
Figure 10.14 Key Input Interrupt Block Diagram
KUPIC register
Interrupt control circuit
Key input interrupt
request
10.9 CAN0/1 Wake-up Interrupt
CAN0/1 wake-up interrupt request is generated when a falling edge is input to CRX0 or CRX1. One interrupt
is allocated to CAN0/1. The CAN0/1 wake-up interrupt is enabled only when the PortEn bit = 1 (CTX/CRX
function) and Sleep bit = 1 (Sleep mode enabled) in the CiCTLR register (i = 0, 1). Figure 10.15 shows the
block diagram of the CAN0/1 wake-up interrupt. Please note that the wake-up message will be lost.
Sleep bit in C0CTLR register
PortEn bit in C0CTLR register
CRX0
Sleep bit in C1CTLR register
PortEn bit in C1CTLR register
C01WKIC register
Interrupt control
circuit
CRX1
Figure 10.15 CAN0/1 Wake-up Interrupt Block Diagram
Rev.2.00 Nov 28, 2005 page 98 of 378
REJ09B0124-0200
CAN0/1 wake-up
interrupt request