ZiLOG Z8 Series User Manual

Z8
®
CPU
User Manual
UM001604-0108 Instruction Set
147
Notation and Binary Encoding
In the detailed instruction descriptions that make up the rest of this chapter, operands and
status flags are represented by a notational shorthand. Operands, condition codes, address
modes, and their notations are as follows (see Table 37 on page 148).
Table 36. Condition Codes
Binary Hex Mnemonic Definition Flag Settings
0000 0 F Always False —
1000 8 (blank) Always True —
0111 7 C Carry C = 1
1111 F NC No Carry C = 0
0110 6 Z Zero Z = 1
1110 E NZ Non-Zero Z = 0
1101 D PL Plus S = 0
0101 5 Ml Minus S = 1
0100 4 OV Overflow V = 1
1100 C NOV No Overflow V = 0
0110 6 EQ Equal Z = 1
1110 E NE Not Equal Z = 0
1001 9 GE Greater Than or Equal (S XOR V) = 0
0001 1 LT Less Than (S XOR V) = 1
1010 A GT Greater Than (Z OR (S XOR V)) = 0
0010 2 LE Less Than or Equal (Z OR (S XOR V)) = 1
1111 F UGE Unsigned Greater Than or Equal C = 0
0111 7 ULT Unsigned Less Than C = 1
1011 B UGT Unsigned Greater Than (C = 0 AND Z = 0) = 1
0011 3 ULE Unsigned Less Than or Equal (C OR Z) = 1

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.