T48C862-R4 datasheet(13/107 Pages) ATMEL

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T48C862-R4 [Preliminary]

4551C–4BMCU–01/04

Microcontroller Block

Features

• 4-Kbyte ROM, 256 x 4-bit RAM

• EEPROM Programmable Options

• Read Protection for the EEPROM Program Memory

• 11 Bi-directional I/Os

• Up to Seven External/Internal Interrupt Sources

• Eight Hardware and Software Interrupt Priorities

• Multifunction Timer/Counter

- IR Remote Control Carrier Generator

- Biphase-, Manchester- and Pulse-width Modulator and Demodulator

- Phase Control Function

• Programmable System Clock with Prescaler and Five Different Clock Sources

• Very Low Sleep Current (< 1 µA)

• 2

× 512-bit EEPROM Data Memory

• 256

× 4-bit RAM Data Memory

• Synchronous Serial Interface (2-wire, 3-wire)

• Watchdog, POR and Brown-out Function

• Voltage Monitoring Inclusive Lo_BAT Detect

Description

The microcontroller is designed with EEPROM cells so it can be programmed several

times. To offer full compatibility with each ROM version, the I/O configuration is stored

into a separate internal EEPROM block during programming. The configuration is down-

loaded to the I/Os with every power-on reset.

Introduction

The microcontroller block is a member of Atmel’s family of 4-bit single-chip microcontrol-

lers. Instead of ROM it contains EEPROM, RAM, parallel I/O ports, two 8-bit

programmable multifunction timer/counters, voltage supervisor, interval timer with

watchdog function and a sophisticated on-chip clock generation with integrated RC-,

32-kHz and 4-MHz crystal oscillators.

Differences between T48C862-R4 and ATAR862 Microcontrollers

Program Memory

The program memory of the devices is realized as an EEPROM. The memory size for

user programs is 4096 bytes. It is programmed as 258

× 16 bytes blocks of data. the

implement LOCK-bit function is user-selectable and protects the device from unautho-

rized read-out of the program memory.

Configuration Memory

An additional area of 32 bytes of the EEPROM is used to store information about the

hardware configuration. All the options that are selectable for the ROM versions are

available to the user. This includes not only the different port options but also the possi-

bilities to select different capacitors for OSC1 and OSC2, the option to enable or disable

the hardlock for the watchdog, the option to select OSC2 instead of OSC1 as external

clock input and the option to enable the external clock monitor as a reset source.

Data Memory

The microcontroller block contains an internal data EEPROM that is organized as two

pages of 32

× 16-bit. To be compatible with the ROM parts, the page used has to be

defined within the application software by writing the 2-wire interface (TWI) command

"09h" to the EEPROM. This command has no effect for the microcontroller block, if it is

left inside the HEX-file for the ROM version. Also for compatibility reasons, the access to

the EEPROM is handled via the MCL (serial interface) as in the corresponding ROM

parts.

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