PFS154 datasheet(82/91 Pages) PADAUK

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PFS154

8bit MTP Type IO Controller

Page 82 of 91

PDK-DS-PFS154_CN_V105 –Jun. 9, 2020

dzsn

Decrement ACC and skip next instruction if ACC is zero

Example:

dzsn

Result:

←

A - 1,skip next instruction if a = 0

Affected flags: 『Y』Z

『Y』C

『Y』AC

『Y』OV

izsn

Increment memory and skip next instruction if memory is zero

Example:

izsn

MEM;

Result:

MEM

←

MEM + 1, skip next instruction if MEM= 0

Affected flags: 『Y』Z

『Y』C

『Y』AC

『Y』OV

dzsn

Decrement memory and skip next instruction if memory is zero

Example:

dzsn

MEM;

Result:

MEM

←

MEM - 1, skip next instruction if MEM = 0

Affected flags: 『Y』Z

『Y』C

『Y』AC

『Y』OV

7.7. System control Instructions

call

label

Function call, address can be full range address space

Example:

call

function1;

Result:

[sp]

←

pc + 1

← function1

←

sp + 2

Affected flags: 『N』Z

『N』C

『N』AC

『N』OV

goto

label

Go to specific address which can be full range address space

Example:

goto

error;

Result:

Go to error and execute program.

Affected flags: 『N』Z

『N』C

『N』AC

『N』OV

ret

Place immediate data to ACC, then return

Example:

ret

0x55;

Result:

A ← 55h

ret ;

Affected flags: 『N』Z

『N』C

『N』AC

『N』OV

ret

Return to program which had function call

Example:

ret;

Result:

← sp - 2

← [sp]

Affected flags: 『N』Z

『N』C

『N』AC

『N』OV

reti

Return to program that is interrupt service routine. After this command is executed, global

interrupt is enabled automatically.

Example: reti;

Affected flags: 『N』Z

『N』C

『N』AC

『N』OV

nop

No operation

Example:

nop;

Result:

nothing changed

Affected flags: 『N』Z

『N』C

『N』AC

『N』OV

pcadd

Next program counter is current program counter plus ACC.

Example:

pcadd

Result: pc

← pc + a

Affected flags: 『N』Z

『N』C

『N』AC

『N』OV

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