Z86C2116FSC datasheet(27/35 Pages) ZILOG

27 / 35 page

Z86C21 MCU

WITH

8K ROM

INSTRUCTION SET NOTATION

Addressing Modes. The following notation is used to

describe the addressing modes and instruction opera-

tions as shown in the instruction summary.

Symbol

Meaning

IRR

Indirect register pair or indirect working-

Irr

Indirect working-register pair only

Indexed address

Direct address

Relative address

Immediate

Working-register address only

Indirect-register or indirect

working-register address

Indirect working-register address only

address

Symbols. The following symbols are used in describing

the instruction set.

Symbol

Meaning

dst

Destination location or contents

src

Source location or contents

Condition code

Indirect address prefix

Stack Pointer

Program Counter

FLAGS

Flag register (Control Register 252)

IMR

Interrupt mask register (R251)

Flags. Control register (R252) contains the following six

flags:

Symbol

Meaning

Carry flag

Zero flag

Sign flag

Overflow flag

Decimal-adjust flag

Half-carry flag

Affected flags are indicated by:

Clear to zero

Set to one

Set to clear according to operation

Unaffected

Undefined

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