ST7265X View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7265X

Low speed USB 8-bit MCU family with up to 32 KB Flash/ROM

STMicroelectronics 

ST7265x

11.2 DATA TRANSFER COPROCESSOR (DTC)

11.2.1 Introduction

The Data Transfer Coprocessor is a Universal Se-

rial/Parallel Communications Interface. By means

of software plug-ins provided by STMicroelectron-

ics, the user can configure the ST7 to handle a

wide range of protocols and physical interfaces

such as:

– 8 or 16-bit IDE mode Compact Flash

– Multimedia Card (MMC protocol)

– SmartMediaCard

– Secure Digital Card

Support for different devices or future protocol

standards does not require changing the micro-

controller hardware, but only installing a different

software plug-in.

Once the plug-in (up to 256 bytes) stored in the

ROM or FLASH memory of the ST7 device is load-

ed in the DTC RAM, and that the DTC operation is

Figure 38. DTC Block Diagram

started, the I/O ports mapped to the DTC assume

specific alternate functions.

Main Features

s Full-Speed data transfer from USB to I/O ports

without ST7 core intervention

s Protocol-independency

s Support for serial and parallel devices

s Maskable Interrupts

11.2.2 Functional Description

The block diagram is shown in Figure 38. The

main function of the DTC is to quickly transfer data

between :

s USB and ST7 I/O ports

s in between ST7 I/O ports

The protocol used to read or write from the I/O port

is defined by the S/W plug-in in the DTC RAM.

ST7 DATA/ADDRESS BUS

DTCPR

MSB

LSB

I/O PORTS

DATA

TRANSFER

COPROCESSOR

DTC RAM

DATA

TRANSFER

BUFFER

DTCCR

00

0

ERR STOP

EN EN LOAD INIT RUN

DTCSR

0 0 0 0 0 0 ERRORSTOP

TO USB

INTERFACE

INTERRUPT REQUEST

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