SAM7X128 Atmel Corporation, SAM7X128 Datasheet - Page 57

• Manufacturer Part Number: SAM7X128
• Manufacturer: Atmel Corporation

Specifications of SAM7X128

• Flash (kbytes): 128 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
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• 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

2.6.3
ARM DDI 0029G
The relationship between ARM-state and Thumb-state registers
The Thumb-state registers relate to the ARM-state registers in the following way:
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•
•
•
•
These relationships are shown in Figure 2-5.
Thumb-state r0–r7 and ARM-state r0–r7 are identical
Thumb-state CPSR and SPSRs and ARM-state CPSR and SPSRs are identical
Thumb-state SP maps onto the ARM-state r13
Thumb-state LR maps onto the ARM-state r14
the Thumb-state PC maps onto the ARM-state PC (r15).
Copyright © 1994-2001. All rights reserved.
Figure 2-5 Mapping of Thumb-state registers onto ARM-state registers
Program counter (PC)
Saved program status
Stack pointer (SP)
Link register (LR)
Current program
register (SPSR)
status register
Thumb state
(CPSR)
r0
r1
r2
r3
r4
r5
r6
r7
Stack pointer (r13)
Link register (r14)
ARM state
Programmer’s Model
PC (r15)
CPSR
SPSR
r10
r11
r12
r0
r1
r2
r3
r4
r5
r6
r7
r8
r9
2-11