SAM7S321 Atmel Corporation, SAM7S321 Datasheet - Page 243

• Manufacturer Part Number: SAM7S321
• Manufacturer: Atmel Corporation

Specifications of SAM7S321

• Flash (kbytes): 32 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 55 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 32
• Ext Interrupts: 32
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 3
• Ssc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 8
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

ARM DDI 0029G
The instruction in Example B-1 on page B-24 causes the contents of the registers to
appear on the data bus. You can then sample and shift out these values.
The use of
any register.
After you have determined the values in the current bank of registers, you might want
to access the banked registers. To do this, you must change mode. Typically, a mode
change can occur only if the core is already in a privileged mode. However, while in
debug state, a mode change from one mode into any other mode can occur. The
debugger must restore the original mode before exiting debug state.
For example, if the debugger has been requested to return the state of the User mode
registers and FIQ mode registers and debug state was entered in Supervisor mode, the
instruction sequence can be as listed in Example B-2.
All these instructions execute at debug speed. Debug speed is much slower than system
speed. This is because between each core clock, 33 clocks occur in order to shift in an
instruction, or shift out data. Executing instructions this slowly is acceptable for
accessing the core state because the ARM7TDMI core is fully static. However, you
cannot use this method for determining the state of the rest of the system.
While in debug state, only the following instructions can be scanned into the instruction
pipeline for execution:
•
•
•
all data processing operations
all load, store, load multiple, and store multiple instructions
MSR and MRS.
Note
Copyright © 1994-2001. All rights reserved.
as the base register for the STM is only for illustration and you can use
Example B-2 Determining state of User and FIQ mode registers
Debug in Depth
B-25