SAM7XC256 Atmel Corporation, SAM7XC256 Datasheet - Page 80

• Manufacturer Part Number: SAM7XC256
• 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

Memory Interface
3.3.6
3-10
Summary of ARM memory cycle timing
A summary of ARM7TDMI processor memory cycle timing is shown in Figure 3-7.
nMREQ
D[31:0]
A[31:0]
MCLK
nRAS
nCAS
SEQ
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N-cycle
a
Figure 3-6 Coprocessor register transfer cycles
nMREQ
A[31:0]
D[31:0]
MCLK
SEQ
a+4
S-cycle
Memory
Figure 3-7 Memory cycle timing
a+8
N-cycle
I-cycle
Memory Coprocessor
C-cycle
C-cycle
ARM DDI 0029G