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LM3S6G65-IQC80-A2T

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型号: LM3S6G65-IQC80-A2T
PDF文件:
  • LM3S6G65-IQC80-A2T PDF文件
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功能描述: Stellaris® LM3S6G65 Microcontroller
PDF文件大小: 6152.12 Kbytes
PDF页数: 共1044页
制造商: TI1[Texas Instruments]
制造商LOGO: TI1[Texas Instruments] LOGO
制造商网址: http://www.ti.com
捡单宝LM3S6G65-IQC80-A2T
PDF页面索引
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120%
chain being accessed. In order to save power when the JTAG port is not being used, the TDO pin
is placed in an inactive drive state when not actively shifting out data. Because TDOcan be connected
to the TDI of another controller in a daisy-chain configuration, the IEEE Standard 1149.1 expects
the value on TDO to change on the falling edge of TCK.
By default, the internal pull-up resistor on the TDO pin is enabled after reset, assuring that the pin
remains at a constant logic level when the JTAG port is not being used. The internal pull-up and
pull-down resistors can be turned off to save internal power if a High-Z output value is acceptable
during certain TAP controller states (see page 436 and page 438).
4.3.2 JTAG TAP Controller
The JTAG TAP controller state machine is shown in Figure 4-2. The TAP controller state machine
is reset to the Test-Logic-Reset state on the assertion of a Power-On-Reset (POR). In order to reset
the JTAG module after the microcontroller has been powered on, the TMS input must be held HIGH
for five TCK clock cycles, resetting the TAP controller and all associated JTAG chains. Asserting
the correct sequence on the TMS pin allows the JTAG module to shift in new instructions, shift in
data, or idle during extended testing sequences. For detailed information on the function of the TAP
controller and the operations that occur in each state, please refer to IEEE Standard 1149.1.
Figure 4-2. Test Access Port State Machine
Test Logic Reset
Run Test Idle Select DR Scan Select IR Scan
Capture DR Capture IR
Shift DR Shift IR
Exit 1 DR Exit 1 IR
Exit 2 DR Exit 2 IR
Pause DR Pause IR
Update DR Update IR
1 11
1 1
1
1 1
1 1
1 1
1 1
1 10 0
00
00
0 0
0 0
0 0
00
0
0
4.3.3 Shift Registers
The Shift Registers consist of a serial shift register chain and a parallel load register. The serial shift
register chain samples specific information during the TAP controller’s CAPTURE states and allows
167July 24, 2012
Texas Instruments-Production Data
Stellaris
®
LM3S6G65 Microcontroller
OBSOLETE: TI has discontinued production of this device.
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