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Chapter 3 Interrupts
III - 42
External Interrupts
3-3-3 Control Registers
The external interrupt input signal, which operated in each external interrupt 0 to 4 interface generate
interrupt requests.
External interrupt 0 to 4 interface are controlled by the external interrupt control register (IRQnICR) and the
both edges interrupt control register (EDGDT). And external interrupt interface 0 to 1 are controlled by the
noise filter control register (NFCTR0), external interrupt interface 2 to 4 are controlled by the noise filter
control register (NFCTR1), and external interrupt interface 4 is controlled the port 6 key interrupt control
register (P6IMD).
Table 3-3-2 shows the list of registers, control external interrupt 0 to 4.
Table 3-3-2 External Interrupt Control Register
R/W : Readable / Writable.
External Interrupt Register Address R/W Function Page
IRQ0ICR x'03FE2' R/W External interrupt 0 control register III -17
EDGDT x'03F8F' R/W Both edges interrupt control register III -49
NFCTR0 x'03F8E' R/W Noise filter control register 0 III -47
IRQ1ICR x'03FE3' R/W External interrupt 1 control register III -18
EDGDT x'03F8F' R/W Both edges interrupt control register III -49
NFCTR0 x'03F8E' R/W Noise filter control register 0 III -47
IRQ2ICR x'03FE4' R/W External interrupt 2 control register III -19
EDGDT x'03F8F' R/W Both edges interrupt control register III -49
NFCTR1 x'03F8D' R/W Noise filter control register 1 III -48
IRQ3ICR x'03FE5' R/W External interrupt 3 control register III -20
EDGDT x'03F8F' R/W Both edges interrupt control register III -49
NFCTR1 x'03F8D' R/W Noise filter control register 1 III -48
IRQ4ICR x'03FE6' R/W External interrupt 4 control register III -21
EDGDT x'03F8F' R/W Both edges interrupt control register III -49
P6IMD x'03F3E' R/W Port 6 key interrupt control register III -50
NFCTR1 x'03F8D' R/W Noise filter control register 1 III -48
External interrupt 4
External interrupt 0
External interrupt 1
External interrupt 2
External interrupt 3