参数资料
型号: ST72F652R4T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, TQFP-64
文件页数: 115/160页
文件大小: 974K
代理商: ST72F652R4T1
ST7265
58/160
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
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 36. 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.
Figure 36. DTC Block Diagram
I/O PORTS
DATA
TRANSFER
COPROCESSOR
LOAD INIT
STOP
00
0
RUN
DTCCR
ERR
EN
MSB
LSB
DTCPR
00
0
0 ERRORSTOP
DTCSR
INTERRUPT REQUEST
TO USB
DATA
BUFFER
DTC RAM
ST7 DATA/ADDRESS BUS
INTERFACE
TRANSFER
1
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