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ST72631K4

LOW SPEED USB 8-BIT MCU FAMILY with up to 16K MEMORY, up to 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I2C

STMicroelectronics 

ST7263

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

Figure 1. General Block Diagram

OSCIN

OSCOUT

VDD

VSS

OSCILLATOR

Internal

CLOCK

OSC/3

OSC/4 or OSC/2

(for USB)

POWER

SUPPLY

WATCHDOG

RESET

CONTROL

8-BIT CORE

ALU

LVD

USB DMA

VPP/TEST

VDDA

VSSA

PROGRAM

MEMORY

(4K/8K/16K Bytes)

RAM

(256/512 Bytes)

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

– 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.

I2C*

PORT A

16-BIT TIMER

PORT B

ADC

PORT C

SCI*

(UART)

USB SIE

PA[7:0]

(8 bits)

PB[7:0]

(8 bits)

PC[2:0]

(3 bits)

USBDP

USBDM

USBVCC

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