ST7SCR datasheet(4/101 Pages) STMICROELECTRONICS

4 / 101 page

ST7SCR

4/101

1 INTRODUCTION

The ST7SCR and ST7FSCR devices are mem-

bers of the ST7 microcontroller family designed for

USB applications. All devices are based on a com-

mon industry-standard 8-bit core, featuring an en-

hanced instruction set.

The ST7SCR ROM devices are factory-pro-

grammed and are not reprogrammable.

The ST7FSCR versions feature dual-voltage

Flash memory with Flash Programming capability.

They operate at a 4MHz external oscillator fre-

quency.

Under software control, all devices can be placed

in WAIT or HALT mode, reducing power consump-

tion when the application is in idle or stand-by

state.

The enhanced instruction set and addressing

modes of the ST7 offer both power and flexibility to

software developers, enabling the design of highly

efficient and compact application code. In addition

to standard 8-bit data management, all ST7 micro-

controllers feature true bit manipulation, 8x8 un-

signed multiplication and indirect addressing

modes.

The devices include an ST7 Core, up to 16 Kbytes

of program memory, up to 512 bytes of user RAM,

up to 35 I/O lines and the following on-chip periph-

erals:

– USB full speed interface with 7 endpoints, pro-

grammable in/out configuration and embedded

3.3V voltage regulator and transceivers (no ex-

ternal components are needed).

– ISO7816-3 UART interface with Programmable

Baud rate from 372 clock pulses up to 11.625

clock pulses

– Smartcard Supply Block able to provide pro-

grammable supply voltage and I/O voltage levels

to the smartcards

– Low voltage reset ensuring proper power-on or

power-off of the device (selectable by option)

– Watchdog Timer

– 8-bit Timer (TBU)

Figure 1. ST7SCR Block Diagram

8-BIT CORE

ALU

OSCIN

OSCOUT

PA6

4MHz

CONTROL

RAM

(512 Bytes)

PROGRAM

(16K Bytes)

MEMORY

8-BIT TIMER

LVD

VPP

USBDP

USBDM

USBVCC

PORT C

PC[7:0]

PB[7:0]

PA[5:0]

SUPPLY

MANAGER

PLL

OSCILLATOR

USB

PORT B

PORT A

USB

DATA

BUFFER

(256 bytes)

DIVIDER

8 MHz

3V/1.8V Vreg

DC/DC

CRDDET

CRDIO

CRDC4

CRDC8

CRDRST

CRDCLK

PD[7:0]

ISO7816 UART

PORT D

CONVERTER

CRDVCC

SELF

WATCHDOG

LED

LED[3:0]

or 4 MHz

48 MHz

DIODE

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