SAM7XC128 Atmel Corporation, SAM7XC128 Datasheet - Page 121

• Manufacturer Part Number: SAM7XC128
• Manufacturer: Atmel Corporation

Specifications of SAM7XC128

• 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
• Dac Resolution (bits): No
• Temp. Sensor: No
• Crypto Engine: AES/DES
• 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

4.8
ARM DDI 0029G
Privileged instructions
The output signal nTRANS allows the implementation of coprocessors, or coprocessor
instructions, that can only be accessed from privileged modes. The signal meanings are
given in Table 4-4.
If used, the nTRANS signal must be sampled at the same time as the coprocessor
instruction is fetched and is used in the coprocessor pipeline Decode stage.
If a User mode process, with nTRANS LOW, tries to access a coprocessor instruction
that can only be executed in a privileged mode, the coprocessor responds with CPA and
CPB HIGH. This causes the ARM7TDMI processor to take the undefined instruction
trap.
Note
Copyright © 1994-2001. All rights reserved.
Table 4-4 Mode identifier signal meanings (nTRANS)
nTRANS
0
1
Meaning
User mode instruction
Privileged mode instruction
Coprocessor Interface
4-17