T48C893 datasheet(6/82 Pages) ATMEL

6 / 82 page

T48C893

Rev. A4, 22-Jan-02

6 (82)

Ordering Information

Extended Type Number

Package

Remarks

T48C893–TK

SSO20

Tube

T48C893–TKQ

SSO20

Taped and reeled

Introduction

The T48C893 is a member of Atmels family of 4-bit

single-chip microcontrollers. Instead of ROM it contains

EEPROM, RAM, parallel I/O ports, two 8-bit program-

mable multifunction timer/counters, voltage supervisor,

interval timer with watchdog function and a sophisticated

on-chip clock generation with integrated RC-, 32-kHz

crystal- and 4-MHz crystal-oscillators.

Differences between

T48C893 and M44Cx90/x92

2.1

Program Memory

The program memory of the MTP devices is realized as

an EEPROM. The memory size for user programs is

4096 Bytes. It is programmed as 258

16 Byte blocks of

data. The implemented LOCK-bit function is user select-

able and protects the device from unauthorized read-out

of the program memory.

2.2

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 possibilities to select different ca-

pacitors 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 op-

tion to enable the external clock monitor as a reset source.

2.3

Data Memory

The T48C893 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 I2C-com-

mand “09h” to the EEPROM. This command has no

effect for the M44Cx90/x92 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 in-

terface) as in the corresponding ROM parts.

2.4

Reset Function

During each reset (power-on or brown-out) the I/O-con-

figuration is deleted and reloaded with the data from the

configuration memory. This leads to a slightly different

behavior compared to the ROM versions. Both devices

switch their I/Os to input during reset but the ROM part

has the mask selected pull-up or pull-down resistors ac-

tive while the MTP has them removed until the download

is finished.

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