H838532H datasheet(101/508 Pages) RENESAS

101 / 508 page

Section 3 Exception Handling

Rev. 1.00 May 30, 2008 Page 81 of 484

REJ09B0436-0100

3.4.2

Notes on Rewriting Port Mode Registers

When a port mode register is rewritten to switch the functions of external interrupt pins, the

following points should be observed.

When an external interrupt pin function is switched by rewriting the port mode register that

controls pins

IRQ

4 to IRQ0, WKP7 to WKP0, the interrupt request flag may be set to 1 at the time

the pin function is switched, even if no valid interrupt is input at the pin. Be sure to clear the

interrupt request flag to 0 after switching pin functions. Table 3.5 shows the conditions under

which interrupt request flags are set to 1 in this way.

Table 3.5

Conditions Under which Interrupt Request Flag is Set to 1

Interrupt Request

Flags Set to 1

Conditions

IRR1

IRRI4

When PMR1 bit IRQ4 is changed from 0 to 1 while pin

IRQ

4 is low and IEGR bit IEG4 = 0.

When PMR1 bit IRQ4 is changed from 1 to 0 while pin

IRQ

4 is low and IEGR bit IEG4 = 1.

IRRI3

When PMR1 bit IRQ3 is changed from 0 to 1 while pin

IRQ

3 is low and IEGR bit IEG3 = 0.

When PMR1 bit IRQ3 is changed from 1 to 0 while pin

IRQ

3 is low and IEGR bit IEG3 = 1.

IRRI2

When PMR1 bit IRQ2 is changed from 0 to 1 while pin

IRQ

2 is low and IEGR bit IEG2 = 0.

When PMR1 bit IRQ2 is changed from 1 to 0 while pin

IRQ

2 is low and IEGR bit IEG2 = 1.

IRRI1

When PMR1 bit IRQ1 is changed from 0 to 1 while pin

IRQ

1 is low and IEGR bit IEG1 = 0.

When PMR1 bit IRQ1 is changed from 1 to 0 while pin

IRQ

1 is low and IEGR bit IEG1 = 1.

IRRI0

When PMR3 bit IRQ0 is changed from 0 to 1 while pin

IRQ

0 is low and IEGR bit IEG0 = 0.

When PMR3 bit IRQ0 is changed from 1 to 0 while pin

IRQ

0 is low and IEGR bit IEG0 = 1.

IWPR

IWPF7

When PMR5 bit WKP7 is changed from 0 to 1 while pin

WKP

7 is low.

IWPF6

When PMR5 bit WKP6 is changed from 0 to 1 while pin

WKP

6 is low.

IWPF5

When PMR5 bit WKP5 is changed from 0 to 1 while pin

WKP

5 is low.

IWPF4

When PMR5 bit WKP4 is changed from 0 to 1 while pin

WKP

4 is low.

IWPF3

When PMR5 bit WKP3 is changed from 0 to 1 while pin

WKP

3 is low.

IWPF2

When PMR5 bit WKP2 is changed from 0 to 1 while pin

WKP

2 is low.

IWPF1

When PMR5 bit WKP1 is changed from 0 to 1 while pin

WKP

1 is low.

IWPF0

When PMR5 bit WKP0 is changed from 0 to 1 while pin

WKP

0 is low.

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