ST90R40C6 datasheet(49/56 Pages) STMICROELECTRONICS

49 / 56 page

ST90R40

ROMLESS HCMOS MCU

WITH EEPROM, RAM AND A/D CONVERTER

(Ordering Information at the end of the Datasheet)

RUN, WFI and HALT modes

Minimum instruction cycle time:500ns

(12MHz internal)

ROMless to allow maximum external memory

flexibility

Internal Memory :

RAM

256 bytes

EEPROM

512 bytes

224 general purpose registers available as

RAM, accumulators or index pointers

(register file)

68-lead Plastic Leaded Chip Carrier package for

ST90R40C

DMA controller, Interrupt handler and Serial Pe-

ripheral Interface as standard features

40 fully programmable I/O pins

Up to 8 external plus 1 non-maskableinterrupts

16 bit Timer with 8 bit Prescaler, able to be used

as a Watchdog Timer

Two 16 bit Multifunction Timers, each with an 8

bit prescaler and 13 operating modes

8 channel 8 bit Analog to Digital Converter, with

Analog Watchdogs and external references

Serial Communications Interface with asynchro-

nous and synchronous capability

Rich Instruction Set and 14 Addressingmodes

Division-by-Zero trap generation

Versatile development tools, including assembler,

linker, C-compiler, archiver, graphic orinted de-

buggerand hardware emulators

Real Time Operating System

Compatible with ST9040 16K ROM device (also

availablein windowed and One Time Programma-

ble EPROM packages)

PLCC68

March 1994

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