Maxim-integrated MAXQ622 Manual do Utilizador descarregar pdf (Página 226)

MAXQ612/MAXQ622 User’s Guide

16-16 Maxim Integrated

PUSH src Push Word to the Stack

Description:

Increases the stack depth (decments the stack pointer SP) and pushes a single word specified by

src to the stack (@SP).

Status Flags:

None

Operation:

SP ← ++SP

Encoding:

f000 1101 ssss ssss

Example(s):

PUSH GR ; GR=0F3Fh

PUSH #40h

Stack Data:

xxxxh

← SP (initial)

0F3Fh

← SP (after PUSH GR)

0040h

← SP (after PUSH #40h)

xxxxh

RET

Return from Subroutine

Description:

RET pops a single word from the stack (@SP) into the Instruction Pointer (IP) and decreases the stack

depth (increments the stack pointer SP). The modified SP is saved as the new stack pointer (SP).

Status Flags:

None

Operation:

IP ← @SP--

Encoding:

1000 1100 0000 1101

Example(s):

RET

Code Execution:

Addr (IP) Opcode

0311h

…

0312h

RET

→

0103h

…

Stack Data:

xxxxh

← SP (after RET)

0103h

← SP (before RET)

xxxxh

1 2 ... 221 222 223 224 225 226 227 228 229 230 231 ... 254 255

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