AT91SAM7S32-AI ATMEL [ATMEL Corporation], AT91SAM7S32-AI Datasheet - Page 113

• Manufacturer Part Number: AT91SAM7S32-AI
• Description: AT91 ARM Thumb-based Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

Table 33. Signal Description List (Continued)
Entering Serial
Programming
Mode
Read/Write
Handshake
6071A–ATARM–28-Oct-04
Signal Name
TST
PGMEN0
PGMEN1
PGMEN2
TCK
TDI
TDO
TMS
Function
Test Mode Select
Test Mode Select
Test Mode Select
Test Mode Select
JTAG TCK
JTAG Test Data In
JTAG Test Data Out
JTAG Test Mode Select
The following algorithm puts the device in Serial Programming Mode:
•
•
•
•
•
•
•
Note:
Table 34. Reset TAP controller and go to Select-DR-Scan
Two registers of the device are accessible through the JTAG:
•
•
Apply GND, VDDIO, VDDCORE, VDDFLASH and VDDPLL.
Apply XIN clock within T
Wait for T
Reset the TAP controller clocking 5 TCK pulses with TMS set.
Shift 0x2 into the IR register ( IR is 4 bits long, LSB first) without going through the Run-
Test-Idle state.
Shift 0x2 into the DR register ( DR is 4 bits long, LSB first) without going through the Run-
Test-Idle state.
Shift 0xC into the IR register ( IR is 4 bits long, LSB first) without going through the Run-
Test-Idle state.
Debug Comms Control Register: DCCR
Debug Comms Data Register: DCDR
After reset, the device is clocked by the internal RC oscillator. Before clearing RDY signal, if an
external clock ( > 32 kHz) is connected to XIN, then the device will switch on the external clock.
Else, XIN input is not considered. An higher frequency on XIN speeds up the programmer
handshake.
TDI
Xt
X
X
X
X
X
X
POR_RESET
.
POR_RESET
JTAG
TMS
Test
1
1
1
1
1
0
1
Output
+ 32(T
Type
Input
Input
Input
Input
Input
Input
Input
TAP Controller State
Test-Logic Reset
Run-Test/Idle
Select-DR-Scan
AT91SAM7S32 Preliminary
SCLK
) if an external clock is available.
Active
Level
High
High
High
Low
-
-
-
-
Comments
Must be connected to VDDIO.
Must be connected to VDDIO
Must be connected to VDDIO
Must be connected to GND
Pulled-up input at reset
Pulled-up input at reset
Pulled-up input at reset
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