ZiLOG Z8 Series User Manual

Z8
®
CPU
User Manual
UM001604-0108 Instruction Description
168
Complement
Syntax
COM dst
Instruction Format
Operation
dst ← NOT dst
The contents of the destination operand are complemented (one’s complement). All 1 bits
are changed to 0, and all 0 bits are changed to 1.
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 Register 08h contains 24h (00100100b), the statement:
COM 08h
Op Code: 60 08
leaves the value DBh (11011011) in Register 08h. The S Flag is set, and the Z and V
Flags are cleared.
Cycles
OPC
(Hex)
Address Mode
dst
OPC dst
660 R
661 IR
Flag Description
C Unaffected
Z Set if the result is zero; cleared otherwise.
S Set if result bit 7 is set; cleared otherwise.
V Always reset to 0.
D Unaffected
H Unaffected
Edst
Note:

ZiLOG Z8 Series Specifications

General

Brand	ZiLOG
Model	Z8 Series
Category	Microcontrollers
Language	English

Summary

Address Space

Z8 CPU Standard Register File

Details the standard register file structure, including I/O, general-purpose, and control registers.

Z8 Expanded Register File (ERF)

Reset

Reset Pin, Internal POR Operation

Explains the function of the RESET pin and internal Power-On Reset for chip initialization.

Watchdog Timer

Watchdog Timer

Describes the retriggerable one-shot timer that resets the CPU if it reaches its terminal count.

Counters and Timers

TIN Modes

Interrupts

Interrupt Sources

Lists interrupt types, sources, and vectors available in the Z8 family processors.

Interrupt Initialization

Power-Down Modes

Halt Mode Operation

Explains HALT mode, suspending execution while keeping the oscillator active.

Stop Mode Operation

Details STOP mode for lowest standby current by turning off internal clocks.

Serial Input/Output

UART Introduction

SPI Operation

Details SPI usage in master and slave modes, including data transfer and chip select.

External Interface

Introduction

External Addressing Configuration

Instruction Set

Processor Flags

Condition Codes

Instruction Description

Provides detailed descriptions of Z8 instructions, including syntax, operation, and flags.