PMC271 datasheet(68/90 Pages) PADAUK

68 / 90 page

PMC271/PMS271 Series

8-bit ADC FPPA

TM 8-bit Controller

Page 68 of 90

PDK-DS-PMX271-EN_V105 – Dec. 18, 2018

xch

Exchange data between ACC and memory

Example:

xch

MEM ;

Result:

MEM ← a , a ← MEM

Affected flags: 『N』Z

『N』C

『N』AC

『N』OV

pushaf

Move the ACC and flag register to memory that address specified in the stack pointer.

Example:

pushaf;

Result:

[sp]

← {flag, ACC};

sp ← sp + 2 ;

Affected flags: 『N』Z

『N』C

『N』AC

『N』OV

Application Example:

------------------------------------------------------------------------------------------------------------------------

.romadr 0x10 ;

// ISR entry address

pushaf ;

// put ACC and flag into stack memory

…

// ISR program

…

// ISR program

popaf ;

// restore ACC and flag from stack memory

reti ;

------------------------------------------------------------------------------------------------------------------------

popaf

Restore ACC and flag from the memory which address is specified in the stack pointer.

Example:

popaf;

Result:

p ← sp - 2 ;

{Flag, ACC}

← [sp] ;

Affected flags: 『Y』Z

『Y』C

『Y』AC

『Y』OV

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