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 IRQ4 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
IRRI3
IRRI2
IRRI1
IRRI0
When PMR1 bit IRQ4 is changed from 0 to 1 while pin IRQ4 is low and IEGR
bit IEG4 = 0.
When PMR1 bit IRQ4 is changed from 1 to 0 while pin IRQ4 is low and IEGR
bit IEG4 = 1.
When PMR1 bit IRQ3 is changed from 0 to 1 while pin IRQ3 is low and IEGR
bit IEG3 = 0.
When PMR1 bit IRQ3 is changed from 1 to 0 while pin IRQ3 is low and IEGR
bit IEG3 = 1.
When PMR1 bit IRQ2 is changed from 0 to 1 while pin IRQ2 is low and IEGR
bit IEG2 = 0.
When PMR1 bit IRQ2 is changed from 1 to 0 while pin IRQ2 is low and IEGR
bit IEG2 = 1.
When PMR1 bit IRQ1 is changed from 0 to 1 while pin IRQ1 is low and IEGR
bit IEG1 = 0.
When PMR1 bit IRQ1 is changed from 1 to 0 while pin IRQ1 is low and IEGR
bit IEG1 = 1.
When PMR3 bit IRQ0 is changed from 0 to 1 while pin IRQ0 is low and IEGR
bit IEG0 = 0.
When PMR3 bit IRQ0 is changed from 1 to 0 while pin IRQ0 is low and IEGR
bit IEG0 = 1.
IWPR IWPF7
IWPF6
When PMR5 bit WKP7 is changed from 0 to 1 while pin WKP7 is low.
When PMR5 bit WKP6 is changed from 0 to 1 while pin WKP6 is low.
When PMR5 bit WKP5 is changed from 0 to 1 while pin WKP5 is low.
When PMR5 bit WKP4 is changed from 0 to 1 while pin WKP4 is low.
When PMR5 bit WKP3 is changed from 0 to 1 while pin WKP3 is low.
When PMR5 bit WKP2 is changed from 0 to 1 while pin WKP2 is low.
When PMR5 bit WKP1 is changed from 0 to 1 while pin WKP1 is low.
When PMR5 bit WKP0 is changed from 0 to 1 while pin WKP0 is low.
IWPF5
IWPF4
IWPF3
IWPF2
IWPF1
IWPF0
86
ETC [ ETC ]
