SAM7XC256 Atmel Corporation, SAM7XC256 Datasheet - Page 49
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SAM7XC256
Manufacturer Part Number
SAM7XC256
Description
Manufacturer
Atmel Corporation
Specifications of SAM7XC256
Flash (kbytes)
256 Kbytes
Pin Count
100
Max. Operating Frequency
55 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
62
Ext Interrupts
62
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
1
Uart
3
Can
1
Ssc
1
Ethernet
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
Dac Resolution (bits)
No
Temp. Sensor
No
Crypto Engine
AES/DES
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
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
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2.2
2.2.1
ARM DDI 0029G
Processor operating states
Switching state
The ARM7TDMI processor has two operating states:
ARM
Thumb
In Thumb state, the Program Counter (PC) uses bit 1 to select between alternate
halfwords.
Transition between ARM and Thumb states does not affect the processor mode or the
register contents.
The operating state of the ARM7TDMI core can be switched between ARM state and
Thumb state using the BX instruction. This is described in the ARM Architecture
Reference Manual.
All exception handling is entered in ARM state. If an exception occurs in Thumb state,
the processor reverts to ARM state. The transition back to Thumb state occurs
automatically on return. An exception handler can change to Thumb state but it must
return to ARM state to allow the exception handler to terminate correctly.
Note
Copyright © 1994-2001. All rights reserved.
32-bit, word-aligned ARM instructions are executed in this state.
16-bit, halfword-aligned Thumb instructions are executed in this state.
Programmer’s Model
2-3
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