SAM9261 Atmel Corporation, SAM9261 Datasheet - Page 264
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SAM9261
Manufacturer Part Number
SAM9261
Description
Manufacturer
Atmel Corporation
Datasheets
1.SAM9260.pdf
(290 pages)
2.SAM9261.pdf
(248 pages)
3.SAM9261.pdf
(749 pages)
4.SAM9261.pdf
(44 pages)
5.SAM9261.pdf
(1274 pages)
6.SAM9261.pdf
(43 pages)
Specifications of SAM9261
Flash (kbytes)
0 Kbytes
Pin Count
217
Max. Operating Frequency
240 MHz
Cpu
ARM926
Hardware Qtouch Acquisition
No
Max I/o Pins
96
Ext Interrupts
96
Usb Transceiver
3
Usb Speed
Full Speed
Usb Interface
Host, Device
Spi
2
Twi (i2c)
1
Uart
4
Ssc
3
Sd / Emmc
1
Graphic Lcd
Yes
Video Decoder
No
Camera Interface
No
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
160
Self Program Memory
NO
External Bus Interface
1
Dram Memory
sdram
Nand Interface
Yes
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8/3.3
Operating Voltage (vcc)
1.08 to 1.32
Fpu
No
Mpu / Mmu
No/Yes
Timers
3
Output Compare Channels
3
Input Capture Channels
3
32khz Rtc
Yes
Calibrated Rc Oscillator
No
- SAM9260 PDF datasheet
- SAM9261 PDF datasheet #2
- SAM9261 PDF datasheet #3
- SAM9261 PDF datasheet #4
- SAM9261 PDF datasheet #5
- SAM9261 PDF datasheet #6
- Current page: 264 of 290
- Download datasheet (5Mb)
Debug in depth
C.8
C.8.1
C.8.2
C-24
Behavior of the program counter during debug
Breakpoints
Watchpoints
you can replace the final branch with a subtract, with the PC as the destination (
The debugger must keep track of what happens to the PC, so that you can force the
ARM9E-S to branch back to the place at which program flow was interrupted by debug.
Program flow can be interrupted by any of the following:
•
•
•
•
•
Entry to debug state from a breakpointed instruction advances the PC by 16 bytes in
ARM state, or 8 bytes in Thumb state. Each instruction executed in debug state
advances the PC by one address (4 bytes). The normal way to exit from debug state after
a breakpoint is to remove the breakpoint and branch back to the previously breakpointed
address.
For example, if the ARM9E-S entered debug state from a breakpoint set on a given
address and two debug speed instructions were executed, a branch of seven addresses
must occur (four for debug entry, plus two for the instructions, plus one for the final
branch). The following sequence shows ARM instructions scanned into scan chain 1.
This is the Most Significant Bit (MSB) first, so the first digit represents the value to be
scanned into the SYSSPEED bit, followed by the instruction.
0 EAFFFFF9 ; B -7 addresses (two’s complement)
1 E1A00000 ; NOP (MOV R0, R0), SYSSPEED bit is set
After the ARM9E-S enters debug state, it must execute a minimum of two instructions
before the branch, although these can both be NOPs (
PC, PC, #28
To return to program execution after entry to debug state from a watchpoint, use the
same procedure described in Breakpoints.
Debug entry adds four addresses to the PC, and every instruction adds one address. The
difference from breakpoint is that the instruction that caused the watchpoint has
executed, and the program must return to the next instruction.
a breakpoint
a watchpoint
a watchpoint when another exception occurs
a debug request
a system speed access.
Copyright © 2000 ARM Limited. All rights reserved.
in the above example).
MOV R0, R0
). For small branches,
ARM DDI 0165B
SUB
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