at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 68

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

12.4
12.5
12.5.1
12.5.2
6249D–ATARM–20-Dec-07
Debug and Test Pin Description
Functional Description
Test Pin
Embedded In-circuit Emulator
Table 12-1.
One dedicated pin, TST, is used to define the device operating mode. The user must make sure
that this pin is tied at low level to ensure normal operating conditions. Other values associated
with this pin are reserved for manufacturing test.
The ARM9EJ-S Embedded In-Circuit Emulator-RT is supported via the ICE/JTAG port. It is con-
nected to a host computer via an ICE interface. Debug support is implemented using an
ARM9EJ-S core embedded within the ARM926EJ-S. The internal state of the ARM926EJ-S is
examined through an ICE/JTAG port which allows instructions to be serially inserted into the
pipeline of the core without using the external data bus. Therefore, when in debug state, a store-
multiple (STM) can be inserted into the instruction pipeline. This exports the contents of the
ARM9EJ-S registers. This data can be serially shifted out without affecting the rest of the
system.
Pin Name
NTRST
NRST
TST
TCK
TDI
TDO
TMS
RTCK
JTAGSEL
TSYNC
TCLK
TPS0 - TPS2
TPK0 - TPK15
DRXD
DTXD
Debug and Test Pin List
Function
Test Reset Signal
Microcontroller Reset
Test Mode Select
Test Clock
Test Data In
Test Data Out
Test Mode Select
Returned Test Clock
JTAG Selection
Trace Synchronization Signal
Trace Clock
Trace ARM Pipeline Status
Trace Packet Port
Debug Receive Data
Debug Transmit Data
ICE and JTAG
Debug Unit
Reset/Test
AT91SAM9263 Preliminary
ETM
Input/Output
Output
Output
Output
Output
Output
Output
Output
Type
Input
Input
Input
Input
Input
Input
Input
Active Level
High
Low
Low
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