SAM3X Datasheet, PDF (8/71 Pages) ATMEL Corporation – AT91SAM ARM-based Flash MCU

Table 3-1. Signal Description List (Continued)
Signal Name
TCK/SWCLK
TDI
TDO/TRACESWO
TMS/SWDIO
Function
Type
ICE and JTAG
Test Clock/Serial Wire Clock
Input
Test Data In
Input
Test Data Out / Trace Asynchronous Data
Out
Output
Test Mode Select /Serial Wire
Input/Output
Input / I/O
Active
Level
Voltage
Reference
VDDIO
JTAGSEL
JTAG Selection
Input
High
VDDBU
ERASE
NRST
NRSTB
TST
URXD
UTXD
Flash Memory
Flash and NVM Configuration Bits
Erase Command
Input
High
Reset/Test
Microcontroller Reset
I/O
Low
Asynchronous Microcontroller Reset
Input
Low
Test Mode Select
Input
Universal Asynchronous Receiver Transceiver - UART
UART Receive Data
Input
UART Transmit Data
Output
VDDIO
VDDIO
VDDBU
VDDBU
Comments
Reset State:
- SWJ-DP Mode
- Internal pull-up
disabled⁽¹⁾
Permanent Internal
pull-down
Pull-down resistor
Pull-up resistor
Pull-up resistor
Pull-down resistor
10 SAM3X/A
11057BS–ATARM–13-Jul-12