ST7263 datasheet(5/109 Pages) STMICROELECTRONICS

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ST7263

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1 GENERAL DESCRIPTION

1.1 INTRODUCTION

The ST7263 Microcontrollers form a sub family of

the ST7 dedicated to USB applications. The de-

vices are based on an industry-standard 8-bit core

and feature an enhanced instruction set. They op-

erate at a 24MHz or 12 MHz oscillator frequency.

Under software control, the ST7263 MCUs may be

placed in either Wait 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 man-

agement, the ST7263 MCUs feature true bit ma-

nipulation, 8x8 unsigned multiplication and indirect

addressing modes. The devices include an ST7

Core, up to 16K program memory, up to 512 bytes

RAM, 19 I/O lines and the following on-chip pe-

ripherals:

– USB low speed interface with 3 endpoints with

programmable in/out configuration using the

DMA architecture with embedded 3.3V voltage

regulator and transceivers (no external compo-

nents are needed).

– 8-bit Analog-to-Digital converter (ADC) with 8

multiplexed analog inputs

– industry standard asynchronous SCI serial inter-

face (not on all products - see device summary

below)

– digital Watchdog

– 16-bit Timer featuring an External clock input, 2

Input Captures, 2 Output Compares with Pulse

Generator capabilities

– fast I2C Multi Master interface (not on all prod-

ucts - see device summary)

– Low voltage (LVD) reset ensuring proper power-

on or power-off of the device

All ST7263 MCUs are available in ROM and OTP

versions.

The ST72E631 is the EPROM version of the

ST7263 in CSDIP32 windowed packages.

A specific mode is available to allow programming

of the EPROM user memory array. This is set by a

specific voltage source applied to the VPP/TEST

pin.

Figure 1. General Block Diagram

8-BIT CORE

ALU

OSCIN

OSCOUT

RESET

PORT B

16-BIT TIMER

PORT A

PORT C

PB[7:0]

(8 bits)

PC[2:0]

(3 bits)

OSCILLATOR

Internal

CLOCK

CONTROL

RAM

(256/512 Bytes)

PA[7:0]

(8 bits)

VSS

VDD

POWER

SUPPLY

SCI*

PROGRAM

(4K/8K/16K Bytes)

I2C*

MEMORY

ADC

(UART)

USB SIE

OSC/3

LVD

WATCHDOG

VSSA

VDDA

VPP/TEST

USB DMA

USBDP

USBDM

USBVCC

OSC/4 or OSC/2

(for USB)

* not on all products (refer to Table 1: Device Summary)

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