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CPU

User Manual

UM001604-0108 Instruction Description

215

PUSH

Syntax

PUSH src

Instruction Format

Operation

SP ← SP–1

@SP ← src

The contents of the SP (stack pointer) are decremented by one, then the contents of the

source operand are loaded into the location addressed by the decremented SP, thus adding

a new element to the stack.

Address modes R or IR can be used to specify a 4-bit Working Register. In this format, the

destination Working Register operand is specified by adding

1110b (Eh) to the high nibble

of the operand. For example, if Working Register R12 (CH) is the destination operand, then

ECh is used as the destination operand in the Op Code.

Example 1

If the SP contains 1001h, the statement:

PUSH FCh

Op Code: 70 FC

stores the contents of Register FCh (the Flag Register) in location 1000h. After the PUSH

operation, the SP contains

1000h.

Cycles

OPC

(Hex)

Address Mode

dst

10 Internal Stack 70

OPC src

12 External Stack R

10 Internal Stack IR

10 External Stack 71

Flag Description

C Unaffected

Z Unaffected

S Unaffected

V Unaffected

D Unaffected

H Unaffected

Edst

Note:

1 2 ... 217 218 219 220 221 222 223 224 225 226 227 ... 259 260

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