TMS320F28069_14 Datasheet, PDF (141/175 Pages) Texas Instruments – Piccolo Microcontrollers

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TMS320F28069, TMS320F28068, TMS320F28067, TMS320F28066
TMS320F28065, TMS320F28064, TMS320F28063, TMS320F28062
SPRS698D – NOVEMBER 2010 – REVISED DECEMBER 2012
5.22 JTAG Port
On the 2806x device, the JTAG port is reduced to 5 pins (TRST, TCK, TDI, TMS, TDO). TCK, TDI, TMS
and TDO pins are also GPIO pins. The TRST signal selects either JTAG or GPIO operating mode for the
pins in Figure 5-48. During emulation/debug, the GPIO function of these pins are not available. If the
GPIO38/TCK/XCLKIN pin is used to provide an external clock, an alternate clock source should be used
to clock the device during emulation/debug since this pin will be needed for the TCK function.
NOTE
In 2806x devices, the JTAG pins may also be used as GPIO pins. Care should be taken in
the board design to ensure that the circuitry connected to these pins do not affect the
emulation capabilities of the JTAG pin function. Any circuitry connected to these pins should
not prevent the emulator from driving (or being driven by) the JTAG pins for successful
debug.
TRST
TRST = 0: JTAG Disabled (GPIO Mode)
TRST = 1: JTAG Mode
TRST
TCK/GPIO38
TDO/GPIO37
TMS/GPIO36
TDI/GPIO35
XCLKIN
GPIO38_in
TCK
GPIO38_out
GPIO37_in
GPIO36_in
GPIO36_out
GPIO35_in
GPIO35_out
C28x
Core
TDO
1
0
GPIO37_out
1
1
0
TMS
1
TDI
1
0
Figure 5-48. JTAG/GPIO Multiplexing
Copyright © 2010–2012, Texas Instruments Incorporated
Peripheral and Electrical Specifications 141
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TMS320F28064 TMS320F28063 TMS320F28062