PFS172 datasheet(52/92 Pages) PADAUK

52 / 92 page

PFS172

8bit MTP MCU with 8-bit ADC

Page 52 of 92

PDK-DS-PFS172-EN_V000-May 8, 2020

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

INTRQ

// clear INTRQ

ENGINT

// 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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