Elan EM78P458 User Manual

EM78P458/459
OTP ROM
EM78P458/459
8-BIT MICRO-CONTROLLER
Version 1.3
ELAN MICROELECTRONICS CORP.
No. 12, Innovation 1
st
RD., Science-Based Industrial Park
Hsin Chu City, Taiwan, R.O.C.
TEL: (03) 5639977
FAX: (03)5782037(SL) 5630118 (FAE)

Elan EM78P458 Specifications

General

Architecture	8-bit
Program Memory	4KB
Operating Voltage	2.5V ~ 5.5V
Timers	2
Operating Temperature	-40°C to +85°C
RAM	128 bytes

Summary

1. GENERAL DESCRIPTION

2. FEATURES

3. PIN ASSIGNMENT

4. FUNCTION DESCRIPTION

4.1 Operational Registers

Describes the operational registers used within the microcontroller.

4. R3 (Status Register)

Details the R3 Status Register, its bits, and functions.

8. R9 (ADCON: Analog to Digital Control)

Details the R9 ADCON register for analog-to-digital conversion control.

14. RF (Interrupt Status Register)

Details the RF Interrupt Status Register and its flags.

4.2 Special Purpose Registers

Introduces special-purpose registers, including the Accumulator.

1. A (Accumulator)

Describes the Accumulator (A) register for data transfer and operand holding.

2. CONT (Control Register)

Details the CONT Control Register, its bits, and functions.

4.3 TCC/WDT & Prescaler

Explains the TCC/WDT prescaler functionality and circuit diagram.

4.4 I/O Ports

Describes the bi-directional I/O ports (Port 5, Port 6) and their control registers.

4.5 RESET and Wake-up

1. The function of RESET and Wake-up

Details the events that initiate RESET and the subsequent device behavior.

4.6 Interrupt

4.7 Analog-To-Digital Converter (ADC)

Describes the ADC circuitry, control registers, and functional block diagram.

4.8 Dual Sets of PWM (Pulse Width Modulation)

1. Overview

Provides an overview of the PWM functionality and output.

4.9 Timer

1. Overview

Introduces the Timer1 and Timer2 functionality.

2. Function description

Describes the TMRX block diagram and signals.

3. Programming the Related Registers

Guides on programming registers related to TMRX and PWMX.

4.10 Comparator

1. External Reference Signal

Explains the external reference signal for the comparator.

2. Comparator Outputs

Details the comparator outputs and their adjustment.

3. Using as An Operation Amplifier

Explains how to use the comparator as an operation amplifier.

4. Interrupt

Describes the interrupt mechanism for the comparator.

5. Wake-up from SLEEP Mode

Explains how the comparator can wake the device from SLEEP mode.

4.11 The Initialized Values after Reset

4.12 Oscillator

1. Oscillator Modes

Lists the four oscillator modes (HXT, LXT, ERC, IC).

2. Crystal Oscillator/Ceramic Resonators (XTAL)

Explains how to use crystals or ceramic resonators with the OSCI pin.

3. External RC Oscillator Mode

Describes the External RC Oscillator mode and its frequency characteristics.

4. RC Oscillator Mode with Internal Capacitor

Explains the RC Oscillator mode with an internal capacitor.

4.13 Power-on Considerations

1. External Power on Reset Circuit

Details an external RC circuit for generating a reset pulse.

2. Residue-Voltage Protection

Explains how to build a residue-voltage protection circuit.

4.14 CODE OPTION

1. Code Option Register (Word 0)

Details the bits and functions of the Code Option Register (Word 0).

2. Code Option Register (Word 1)

Details the bits and functions of the Code Option Register (Word 1).

4.15 Instruction Set

4.16 Timing Diagrams

AC Test Input/Output Waveform

Shows the AC test input/output waveform and measurement points.

RESET Timing (CLK="0")

Depicts the reset timing diagram.

TCC Input Timing (CLKS="0")

Illustrates the TCC input timing diagram.

5. ABSOLUTE MAXIMUM RATINGS

6.1 DC Electrical Characteristic

6.2 AC Electrical Characteristic

Lists the AC electrical characteristics of the microcontroller.

6.3 A/D Converter Characteristic

Details the A/D converter characteristics.

6.4 Comparator(OP) Characteristic

Lists the comparator characteristics.

APPENDIX

Package Types:

Lists the available package types for the microcontrollers.