SPRS698J November 2010 – September 2021 TMS320F28062 , TMS320F28062F , TMS320F28063 , TMS320F28064 , TMS320F28065 , TMS320F28066 , TMS320F28067 , TMS320F28068F , TMS320F28068M , TMS320F28069 , TMS320F28069F , TMS320F28069M
PRODUCTION DATA
On the 2806x device, the JTAG port is reduced to five 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 8-54. During 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 debug because this pin will be needed for the TCK function.
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 debug capabilities of the JTAG pin function. Any circuitry connected to these pins should not prevent the debug probe from driving (or being driven by) the JTAG pins for successful debug.