
10-40
ML63326 User's Manual
Chapter 10 Ports (INPUT, OUTPUT, I/O PORT)
10.8.3 Port F External Interrupt Function (External Interrupt 3)
Port F has external interrupt 3 allocated as secondary function.
External interrupt generation for PF is triggered by the falling edge of the 128 Hz or 4 kHz time
base counter, which is the sampling clock.
After the port level changes, the interrupt request signal (XI3INT) is output, and the interrupt
request flag (QXI3) is set. The maximum delay for this sequence is one cycle of the sampling
clock (128 Hz or 4 kHz).
Because the port F external interrupt is set by a level change at any of the port F inputs, each
bit of the port must be read to determine which bit of port F generated the interrupt.
The interrupt start address for external interrupt 3 is 001AH.
Figure 10-18 shows the external interrupt 3 generation timing.
Figure 10-19 shows the equivalent circuit for external interrupt 3 control.
QXI3
XI3INT
PF.n
128 Hz or
4 kHz
(n = 0–3)
Figure 10-18 External Interrupt 3 Generation Timing
Figure 10-19 External Interrupt 3 Control Equivalent Circuit
Level change
detect circuit
128 Hz
4 kHz
PFMOD
PFF
IE1.1
IE1
EXI3
to interrupt priority
encoder
IRQ1.1
IRQ1
QXI3
XI3INT
PF0IE
PF1IE
PF2IE
PF3IE
PFIE
PF.0
PF.1
PF.2
PF.3
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Страница 84: ...Time Base Counter TBC Chapter 6 6 ...
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Страница 180: ...Chapter 12 12 Melody Driver MELODY63K ...
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Страница 256: ...Chapter 17 17 Power Supply Circuit POWER ...
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Страница 321: ...Appendix 60 ML63326 User s Manual Appendix G ...