參數(shù)資料
型號: ST72651R4
英文描述: ST7 - LOW-POWER. FULL-SPEED USB 8-BIT MCU WITH 32K FLASH. 5K RAM. FLASH CARD I/F. TIMER. PWM. ADC. I2C
中文描述: ST7的-低功耗。全速USB 8位32K快閃微控制器。 5K內存。閃存卡的I /樓計時器。脈寬調制。 ADC的。的I2C
文件頁數(shù): 125/166頁
文件大?。?/td> 2089K
代理商: ST72651R4
ST7265x
61/166
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 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.
Figure 38. 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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