參數(shù)資料
型號(hào)： MD80C52EXXX-20
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40
封裝： CERAMIC, DIP-40
文件頁(yè)數(shù)： 37/80頁(yè)
文件大?。?/td> 5152K
代理商： MD80C52EXXX-20
228
2466T–AVR–07/10
ATmega16(L)
IEEE 1149.1
(JTAG)
Boundary-scan
Features
JTAG (IEEE std. 1149.1 Compliant) Interface
Boundary-scan Capabilities According to the JTAG Standard
Full Scan of all Port Functions as well as Analog Circuitry having Off-chip Connections
Supports the Optional IDCODE Instruction
Additional Public AVR_RESET Instruction to Reset the AVR
System Overview
The Boundary-scan chain has the capability of driving and observing the logic levels on the digi-
tal I/O pins, as well as the boundary between digital and analog logic for analog circuitry having
Off-chip connections. At system level, all ICs having JTAG capabilities are connected serially by
the TDI/TDO signals to form a long Shift Register. An external controller sets up the devices to
drive values at their output pins, and observe the input values received from other devices. The
controller compares the received data with the expected result. In this way, Boundary-scan pro-
vides a mechanism for testing interconnections and integrity of components on Printed Circuits
Boards by using the four TAP signals only.
The four IEEE 1149.1 defined mandatory JTAG instructions IDCODE, BYPASS, SAMPLE/PRE-
LOAD, and EXTEST, as well as the AVR specific public JTAG instruction AVR_RESET can be
used for testing the Printed Circuit Board. Initial scanning of the Data Register path will show the
ID-code of the device, since IDCODE is the default JTAG instruction. It may be desirable to have
the AVR device in Reset during Test mode. If not reset, inputs to the device may be determined
by the scan operations, and the internal software may be in an undetermined state when exiting
the Test mode. Entering reset, the outputs of any Port Pin will instantly enter the high impedance
state, making the HIGHZ instruction redundant. If needed, the BYPASS instruction can be
issued to make the shortest possible scan chain through the device. The device can be set in
the reset state either by pulling the external RESET pin low, or issuing the AVR_RESET instruc-
tion with appropriate setting of the Reset Data Register.
The EXTEST instruction is used for sampling external pins and loading output pins with data.
The data from the output latch will be driven out on the pins as soon as the EXTEST instruction
is loaded into the JTAG IR-Register. Therefore, the SAMPLE/PRELOAD should also be used for
setting initial values to the scan ring, to avoid damaging the board when issuing the EXTEST
instruction for the first time. SAMPLE/PRELOAD can also be used for taking a snapshot of the
external pins during normal operation of the part.
The JTAGEN Fuse must be programmed and the JTD bit in the I/O Register MCUCSR must be
cleared to enable the JTAG Test Access Port.
When using the JTAG interface for Boundary-scan, using a JTAG TCK clock frequency higher
than the internal chip frequency is possible. The chip clock is not required to run.
Data Registers
The Data Registers relevant for Boundary-scan operations are:
Bypass Register
Device Identification Register
Reset Register
Boundary-scan Chain
Bypass Register
The Bypass Register consists of a single Shift Register stage. When the Bypass Register is
selected as path between TDI and TDO, the register is reset to 0 when leaving the Capture-DR
相關(guān)PDF資料
PDF描述
MR80C52CXXX-12SHXXX 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQCC44
MC80C52CXXX-12SB 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CDIP40
MQ80C32-25SCD 8-BIT, 25 MHz, MICROCONTROLLER, CQFP44
MQ80C32E-20SHXXX:D 8-BIT, 20 MHz, MICROCONTROLLER, CQFP44
MD80C52CXXX-16SCD 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MD80C86 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor
MD80C862 制造商:Intel 功能描述:PROCESSOR:MICRO-PROCESSOR
MD80C86-2 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor
MD80C86-2/883 制造商:Intersil Corporation 功能描述:MPU 16BIT CMOS 8MHZ 40CDIP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:CPU 16BILT 5V CMOS 8MHZ 40CDIP - Bulk
MD80C86-2/B 制造商:Intersil Corporation 功能描述:MPU 16BIT CMOS 8MHZ 40CDIP - Rail/Tube
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*