MCS11 datasheet(85/108 Pages) PADAUK

85 / 108 page

MCS11

ADC-Type Enhanced FPPA

TM Controller

Page 85 of 108

PDK-DS-MCS11_v020 – Apr. 20, 2018

popw

word

Move the memory data from the address specified in the stack pointer to the word memory

(popw word). It needs 2T to execute this instruction.

Example:

popw

word;

Result:

sp ← sp - 2 ;

word

← [sp] ;

Affected flags: 『N』Z

『N』C

『N』AC

『N』OV

Application Example:

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

word

data0 ;

// declare data0 in RAM

word

data1 ;

// declare data1 in RAM

…

mov

a, 0x55 ;

mov

ld@data0, a ;

// move 0x55 to data0 (LSB)

mov

a, 0xaa ;

mov

hd@data0, a ;

// move 0xaa to data0 (MSB)

pushw

data0 ;

// move data (0xaa, 0x55) to stack memory (word)

popw

data1 ;

// move (0xaa, 0x55) in stack memory to data1 (word)

mov

a, ld@ptr1 ;

// ACC=0x55

mov

a, hd@ptr1 ;

// ACC=0xaa

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

popw

pcN

Restore the program counter of the Nth FPP unit from the memory which address is

specified in the stack pointer of current executing FPP unit (popw pcN). It needs 2T to

execute this instruction.

Example:

popw

pc3;

Result:

sp of FPP

0 ← sp of FPP0 - 2 ;

pc of FPP

3 ← [sp] of FPP0 ;

Affected flags: 『N』Z

『N』C

『N』AC

『N』OV

Example :

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

fpp0_loop:

…

pushw

pc1 ;

// store PC1 to stack memory

nop;

…

popw

pc1 ;

// restore PC1 from stack memory

…

goto

fpp0_loop ;

fpp1_loop:

…

goto

fpp1_loop ;

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

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