HD6433713 datasheet(69/324 Pages) RENESAS

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3.2.3 Interrupt Control Registers

Table 3-3 lists the registers that are used to control interrupts.

Table 3-3 Interrupt Control Registers

Abbreviation

R/W

Initial Value

Address

Port mode register 1

PMR1

R/W

H'0C

H'FFEB

IRQ edge select register

IEGR

R/W

H'EC

H'FFF2

Interrupt enable register 1

IENR1

R/W

H'C0

H'FFF3

Interrupt enable register 2

IENR2

R/W

H'00

H'FFF4

Interrupt enable register 3

IENR3

R/W

H'3C

H'FFF5

Interrupt request register 1

IRR1

R/W*

H'C0

H'FFF6

Interrupt request register 2

IRR2

R/W*

H'00

H'FFF7

Interrupt request register 3

IRR3

R/W*

H'3C

H'FFF8

Note: * Write is enabled only for writing of 0 to clear flag.

Port mode register 1 (PMR1)

PMR1 is an 8-bit read/write register that designates whether pins in port 1 are used for general-

purpose I/O or for external interrupt input. It is also used to turn the noise canceller function of

pin IRQ0 on or off.

Note: Before switching a pin function by modifying bit IRQ5, IRQ4, IRQ1, or IRQ0 in PMR1,

first clear the interrupt enable flag to disable the interrupt. After the pin function has been

switched, issue any instruction, then clear the interrupt request flag to 0.

Program example:

MOV. B R0L, @IENR1

...................... Disable interrupt

MOV. B R0L, @PMR1

...................... Change pin function

NOP

...................... Issue any instruction

MOV. B R0L, @IRR1

...................... Clear interrupt request flag

MOV. B R1L, @IENR1

...................... Enable interrupt

Bit

Initial value

Read/Write

R/W

EVENT

R/W

IRQC5

R/W

IRQC4

R/W

—

IRQC0

R/W

—

IRQC1

R/W

NOISE

CANCEL

HD6433713 Datasheet(PDF) 69 Page - Renesas Technology Corp

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