ST72E331 datasheet(5/107 Pages) STMICROELECTRONICS

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ST72E331 ST72T331

1 GENERAL DESCRIPTION

1.1 INTRODUCTION

The

ST72T331

HCMOS

Microcontroller

Unit

(MCU) is a member of the ST7 family. The device

is based on an industry-standard 8-bit core and

features an enhanced instruction set. The device

is normally operated at a 16 MHz oscillator fre-

quency. Under software control, the ST72T331

may be placed in either Wait, Slow or Halt modes,

thus reducing power consumption. The enhanced

instruction set and addressing modes afford real

programming potential. In addition to standard

8-bit data management, the ST72T331 features

true bit manipulation, 8x8 unsigned multiplication

and indirect addressing modes on the whole mem-

ory. The device includes a low consumption and

fast start on-chip oscillator, CPU, program memo-

ry (OTP/EPROM versions), EEPROM, RAM, 44

(QFP64 and SDIP56) or 32 (QFP44 and SDIP42)

I/O lines, a Low Voltage Detector (LVD) and the

following on-chip peripherals: Analog-to-Digital

converter (ADC) with 8 (QFP64, SDIP56) or 6

(QFP44, SDIP42) multiplexed analog inputs, in-

dustry standard synchronous SPI and asynchro-

nous SCI serial interfaces, digital Watchdog, two

independent 16-bit Timers, one featuring an Exter-

nal Clock Input, and both featuring Pulse Genera-

tor capabilities, 2 Input Captures and 2 Output

Compares (only 1 Input Capture and 1 Output

Compare on Timer A).

Figure 1. ST72T331 Block Diagram

8-BIT CORE

ALU

OSCIN

OSCOUT

RESET

PORT B

TIMER B

PORT C

SPI

PORT E

SCI

PORT D

8-BIT ADC

WATCHDOG

PB0 -> PB7

PC0 -> PC7

PE0 -> PE7

PD0 -> PD7

OSC

Internal

CLOCK

CONTROL

RAM

(384 - 512 Bytes)

PORT F

PF0 -> PF2,4,6,7

TIMER A

PORT A

PA0 -> PA7

VSSA

VDDA

(6 bits for ST72T331N)

(6 bits)

EEPROM

(256 Bytes)

AND LVD

(2 bits for ST72T331J)

(8 bits for ST72T331N)

(6 bits for ST72T331J)

(8 bits for ST72T331N)

(5 bits for ST72T331J)

(8 bits)

(8 bits for ST72T331N)

(5 bits for ST72T331J)

VSS

VDD

POWER

SUPPLY

PROGRAM

(8 - 16K Bytes)

MEMORY

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