PFS122
8bit MTP MCU with 12-bit R-Type ADC
User must reserve enough stack memory for interrupt, two bytes stack memory for one level interrupt and four
bytes for two levels interrupt. For interrupt operation, the following sample program shows how to handle the
interrupt, noticing that it needs four bytes stack memory to handle interrupt and pushaf.
void
{
FPPA0
(void)
...
$
INTEN PA0;
// INTEN =1; interrupt request when PA0 level changed
// clear INTRQ
INTRQ
ENGINT
...
=
0;
// global interrupt enable
DISGINT
...
// global interrupt disable
}
void
{
Interrupt (void)
// interrupt service routine
PUSHAF
// store ALU and FLAG register
// If INTEN.PA0 will be opened and closed dynamically,
// user can judge whether INTEN.PA0 =1 or not.
// Example: If (INTEN.PA0 && INTRQ.PA0) {…}
// If INTEN.PA0 is always enable,
// user can omit the INTEN.PA0 judgement to speed up interrupt service routine.
If (INTRQ.PA0)
{
// Here for PA0 interrupt service routine
INTRQ.PA0 = 0;
// Delete corresponding bit (take PA0 for example)
...
}
...
// X : INTRQ = 0;
// It is not recommended to use INTRQ = 0 to clear all at the end of
the
// interrupt service routine.
// It may accidentally clear out the interrupts that have just occurred
// and are not yet processed.
POPAF
}
// restore ALU and FLAG register
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PDK-DS-PFS122-EN_V000-May 28, 2020
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