参数资料
型号: ST72651AR6T1E/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, MICROCONTROLLER, PQFP64
封装: 10 X 10 MM, ROHS COMPLIANT, TQFP-64
文件页数: 115/161页
文件大小: 2656K
代理商: ST72651AR6T1E/XXX
ST72651AR6
57/161
Doc ID 7215 Rev 4
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
FLASH memory of the ST7 device is loaded in the
DTC RAM, and that the DTC operation is started,
the I/O ports mapped to the DTC assume specific
alternate functions.
Main Features
Full-Speed data transfer from USB to I/O ports
without ST7 core intervention
Protocol-independency
Support for serial and parallel devices
Maskable Interrupts
11.2.2 Functional Description
The block diagram is shown in Figure 34. The
main function of the DTC is to quickly transfer data
between:
USB and ST7 I/O ports
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.
Figure 34. DTC Block Diagram
I/O PORTS
DATA
TRANSFER
COPROCESSOR
LOAD INIT
STOP
0
RUN
DTCCR
ERR
EN
MSB
LSB
DTCPR
0
0 ERRORSTOP
DTCSR
INTERRUPT REQUEST
TO USB
DATA
BUFFER
DTC RAM
ST7 DATA/ADDRESS BUS
INTERFACE
TRANSFER
1
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