SAM7SE256 Atmel Corporation, SAM7SE256 Datasheet - Page 20

• Manufacturer Part Number: SAM7SE256
• Manufacturer: Atmel Corporation

Specifications of SAM7SE256

• Flash (kbytes): 256 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 48 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 88
• Ext Interrupts: 88
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 3
• Ssc: 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
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

7.8
20
Peripheral DMA Controller
SAM7SE512/256/32
• Handles data transfer between peripherals and memories
• Eleven channels
• Low bus arbitration overhead
• Next Pointer management for reducing interrupt latency requirements
• Peripheral DMA Controller (PDC) priority is as follows (from the highest priority to the lowest):
– Two for each USART
– Two for the Debug Unit
– Two for the Serial Synchronous Controller
– Two for the Serial Peripheral Interface
– One for the Analog-to-digital Converter
– One Master Clock cycle needed for a transfer from memory to peripheral
– Two Master Clock cycles needed for a transfer from peripheral to memory
Receive
Receive
Receive
Receive
Receive
Receive
Transmit
Transmit
Transmit
Transmit
Transmit
DBGU
USART0
USART1
SSC
ADC
SPI
DBGU
USART0
USART1
SSC
SPI
6222F–ATARM–14-Jan-11