SAM7X256 Atmel Corporation, SAM7X256 Datasheet - Page 112

• Manufacturer Part Number: SAM7X256
• Manufacturer: Atmel Corporation

Specifications of SAM7X256

• 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
• 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: 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

Coprocessor Interface
4.4.4
4-8
Decode stage
Fetch stage
Execute
D[31:0]
Consequences of busy-waiting
MCLK
stage
nCPI
CPA
CPB
ADD
Instr fetch
(ADD)
CPA and CPB are ignored by the ARM7TDMI processor when it does not have a
undefined or coprocessor instruction in the Execute stage of the pipeline.
A summary of coprocessor signaling is listed in Table 4-3 on page 4-7.
A busy-waited coprocessor instruction can be interrupted. If a valid FIQ or IRQ occurs
and the appropriate bit is clear in the CSPR, then the ARM7TDMI processor abandons
the coprocessor instruction, and signals this by taking nCPI HIGH. A coprocessor that
is capable of busy-waiting must monitor nCPI to detect this condition. When the
ARM7TDMI core abandons a coprocessor instruction, the coprocessor also abandons
the instruction, and continues tracking the ARM7TDMI processor pipeline.
ADD
SUB
Instr fetch
(SUB)
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CDP
SUB
ADD
Instr fetch
(CDP)
CDP
TST
SUB
Instr fetch
(TST)
Instr fetch
(SUB)
Coprocessor
busy waiting
Figure 4-1 Coprocessor busy-wait sequence
CDP
SUB
TST
SUB
TST
Instr fetch
ARM DDI 0029G
SUB
Instr fetch