PFS172 datasheet(74/92 Pages) PADAUK

74 / 92 page

PFS172

8bit MTP MCU with 8-bit ADC

Page 74 of 92

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

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:

sp ← sp - 2 ;

{Flag, ACC} ← [sp] ;

Affected flags: 『Y』Z

『Y』C

『Y』AC

『Y』OV

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