ST7263BHX datasheet(6/145 Pages) STMICROELECTRONICS

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ST7263BDx ST7263BHx ST7263BKx ST7263BE

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1 Introduction

The ST7263B microcontrollers form a sub-family

of the ST7 MCUs dedicated to USB applications.

The devices are based on an industry-standard 8-

bit core and feature an enhanced instruction set.

They operate at a 24 MHz or 12 MHz oscillator fre-

quency. Under software control, the ST7263B

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 management, the ST7263B MCUs feature

true bit manipulation, 8x8 unsigned multiplication

and indirect addressing modes. The devices in-

clude an ST7 Core, up to 32Kbytes of program

memory, up to 1024 bytes of RAM, 27 I/O lines

and the following on-chip peripherals:

– 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 12

multiplexed analog inputs

– Industry standard asynchronous SCI serial inter-

face

– Watchdog

– 16-bit timer featuring an external clock input, 2

Input Captures, 2 Output Compares with Pulse

Generator capabilities

– Fast I²C multimaster interface

– Low voltage reset (LVD) ensuring proper power-

on or power-off of the device

The ST72F63B devices are Flash versions. They

support programming in IAP mode (in-application

programming) via the on-chip USB interface.

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

(1024 bytes)

PA[7:0]

(8 bits)

VSS

VDD

POWER

SUPPLY

SCI

PROGRAM

(32K bytes)

I²C

MEMORY

ADC1)

(UART)

USB SIE

OSC/3

LVD

WATCHDOG

VSSA

VDDA

VPP/TEST

USB DMA

USBDP

USBDM

USBVCC

OSC/4 or OSC/2

for USB2)

PORT D

PD[7:0]

(8 bits)

1) ADC channels:

2) 12 or 24 MHz OSCIN frequency required to generate 6 MHz USB clock.

None on 24-pin devices

8 on 34 and 32-pin devices (Port B)

12 on 48-pin devices (Port B and Port D[3:0])

3) The drive from USBVCC is sufficient to only drive an external pull-up in additoin to the internal transceiver

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