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型號(hào)：	MD83C154TXXX-16/883
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40
文件頁(yè)數(shù)：	126/839頁(yè)
文件大小：	61013K
代理商：	MD83C154TXXX-16/883

ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]

8285E–AVR–02/2013

Figure 24-2. TAP Controller State diagram.

TAP Controller

The TAP controller is a 16-state finite state machine that controls the operation of the Boundary-scan circuitry,

JTAG programming circuitry, or On-chip Debug system. The state transitions depicted in Figure 24-2 depend on

the signal present on TMS (shown adjacent to each state transition) at the time of the rising edge at TCK. The ini-

tial state after a Power-on Reset is Test-Logic-Reset.

As a definition in this document, the LSB is shifted in and out first for all Shift Registers.

Assuming Run-Test/Idle is the present state, a typical scenario for using the JTAG interface is:

At the TMS input, apply the sequence 1, 1, 0, 0 at the rising edges of TCK to enter the Shift Instruction Register –

Shift-IR state. While in this state, shift the four bits of the JTAG instructions into the JTAG Instruction Register

from the TDI input at the rising edge of TCK. The TMS input must be held low during input of the 3 LSBs in order

to remain in the Shift-IR state. The MSB of the instruction is shifted in when this state is left by setting TMS high.

While the instruction is shifted in from the TDI pin, the captured IR-state 0x01 is shifted out on the TDO pin. The

JTAG Instruction selects a particular Data Register as path between TDI and TDO and controls the circuitry

surrounding the selected Data Register

Apply the TMS sequence 1, 1, 0 to re-enter the Run-Test/Idle state. The instruction is latched onto the parallel

output from the Shift Register path in the Update-IR state. The Exit-IR, Pause-IR, and Exit2-IR states are only

used for navigating the state machine

Test-Logic-Reset

Run-Test/Idle

Select-IR Scan

Select-DR Scan

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MR83C154CXXX-L16P883R	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44
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