SAM7S256 Atmel Corporation, SAM7S256 Datasheet - Page 242
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
SAM7S256
Manufacturer Part Number
SAM7S256
Description
Manufacturer
Atmel Corporation
Specifications of SAM7S256
Flash (kbytes)
256 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)
64
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
- Current page: 242 of 284
- Download datasheet (2Mb)
Debug in Depth
B.8
B.8.1
B-24
Determining the core and system state
Determining the core state
When the ARM7TDMI core is in debug state, you examine the core and system state
by forcing the load and store multiples into the instruction pipeline.
Before you can examine the core and system state, the debugger must determine if the
processor entered debug from Thumb state or ARM state, by examining bit 4 of the
EmbeddedICE debug status register. When bit 4 is HIGH, the core has entered debug
from Thumb state, when bit 4 is LOW, the core has entered debug entered from ARM
state.
When the processor has entered debug state from Thumb state, the simplest course of
action is for the debugger to force the core back into ARM state. The debugger can then
execute the same sequence of instructions to determine the processor state.
To force the processor into ARM state while in debug, execute the following sequence
of Thumb instructions on the core:
Because all Thumb instructions are only 16 bits long, the simplest course of action,
when shifting scan chain 1, is to repeat the instruction. For example, the encoding for
to keep track of the half of the bus on which the processor expects to read the data.
You can use the sequences of ARM instructions in Example B-1 and Example B-2 on
page B-25 to determine the state of the processor.
With the processor in the ARM state, the instruction to execute is shown in
Example B-1.
is
Note
Copyright © 1994-2001. All rights reserved.
, so when
Example B-1 Instruction to determine core state
shifts into scan chain 1, the debugger does not have
ARM DDI 0029G
Related parts for SAM7S256
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![U641B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
![U4082B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
![U4089B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
![U4255BM-M](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
![U4089B-P](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
![TDA4470](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet:
![ATF22V10B-25PC](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
High-performance EE PLD
Manufacturer:
ATMEL Corporation
Datasheet:
![AT89C51ED2-IM](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
8-bit Flash Microcontroller
Manufacturer:
ATMEL Corporation
Datasheet:
![AT24C01](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
2-Wire Serial EEPROM
Manufacturer:
ATMEL Corporation
Datasheet:
![U6046B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
U6046BREAR WINDOW HEATING TIMER / LONG-TERM TIMER
Manufacturer:
ATMEL Corporation
Datasheet: