Table 3-5 Reset, NMI and JTAG Terminal Functions
SIGNAL |
|
TYPE(1)
|
PULL(2)
|
POWER
GROUP(4)
|
DESCRIPTION |
NAME |
NO. |
RESET
|
RESET
|
K14 |
I |
— |
B |
Device reset input |
NMI
|
J17 |
I |
IPU |
B |
Non-Maskable Interrupt |
RESETOUT / UHPI_HAS / PRU1_R30[14] / GP6[15] |
T17 |
O(3)
|
CP[21] |
C |
Reset output |
JTAG
|
TMS
|
L16 |
I |
IPU |
B |
JTAG test mode select |
TDI
|
M16 |
I |
IPU |
B |
JTAG test data input |
TDO
|
J18 |
O |
IPU |
B |
JTAG test data output |
TCK
|
J15 |
I |
IPU |
B |
JTAG test clock |
TRST
|
L17 |
I |
IPD |
B |
JTAG test reset |
EMU0
|
J16 |
I/O |
IPU |
B |
Emulation pin |
EMU1
|
K16 |
I/O |
IPU |
B |
Emulation pin |
RTCK/ GP8[0](5)
|
K17 |
I/O |
IPD |
B |
General-purpose input/output |
(1) I = Input, O = Output, I/O = Bidirectional, Z = High impedance, PWR = Supply voltage, GND = Ground, A = Analog signal.
Note: For multiplexed pins where functions have different types (ie., input versus output), the table reflects the pin function direction for that particular peripheral.
(2) IPD = Internal Pulldown resistor, IPU = Internal Pullup resistor. CP[n] = configurable pull-up/pull-down (where n is the pin group) using the PUPDENA and PUPDSEL registers in the System Module. For more detailed information on pullup/pulldown resistors and situations where external pullup/pulldown resistors are required, see the
Device Configuration section. For electrical specifications on pullup and internal pulldown circuits, see the
Device Operating Conditions section.
(3) Open drain mode for RESETOUT function.
(4) This signal is part of a dual-voltage IO group (A, B or C). These groups can be operated at 3.3V or 1.8V nominal. The three groups can be operated at independent voltages but all pins withina group will operate at the same voltage. Group A operates at the voltage of power supply DVDD3318_A. Group B operates at the voltage of power supply DVDD3318_B. Group C operates at the voltage of power supply DVDD3318_C.
(5) GP8[0] is initially configured as a reserved function after reset and will not be in a predictable state. This signal will only be stable after the GPIO configuration for this pin has been completed. Users should carefully consider the system implications of this pin being in an unknown state after reset.