SAM7SE256 Atmel Corporation, SAM7SE256 Datasheet - Page 123

• 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

20.2.5
20.2.5.1
20.2.5.2
6222F–ATARM–14-Jan-11
Device Operations
Flash Read Command
Flash Write Command
Several commands on the Flash memory are available. These commands are summarized in
Table 20-3 on page
face running several read/write handshaking sequences.
When a new command is executed, the previous one is automatically achieved. Thus, chaining
a read command after a write automatically flushes the load buffer in the Flash.
This command is used to read the contents of the Flash memory. The read command can start
at any valid address in the memory plane and is optimized for consecutive reads. Read hand-
shaking can be chained; an internal address buffer is automatically increased.
Table 20-6.
This command is used to write the Flash contents.
The Flash memory plane is organized into several pages. Data to be written are stored in a load
buffer that corresponds to a Flash memory page. The load buffer is automatically flushed to the
Flash:
Step
1
2
3
6
7
...
n
n+1
n+2
n+3
n+4
n+5
...
• before access to any page other than the current one
• when a new command is validated (MODE = CMDE)
Handshake Sequence
Write handshaking
Write handshaking
Write handshaking
Read handshaking
Read handshaking
...
Write handshaking
Write handshaking
Write handshaking
Write handshaking
Read handshaking
Read handshaking
...
Read Command
120. Each command is driven by the programmer through the parallel inter-
MODE[3:0]
CMDE
ADDR0
ADDR1
DATA
DATA
...
ADDR0
ADDR1
ADDR2
ADDR3
DATA
DATA
...
DATA[15:0]
READ
32-bit Memory Address First byte
32-bit Flash Address
*Memory Address++
*Memory Address++
...
32-bit Memory Address First byte
32-bit Flash Address
32-bit Flash Address
32-bit Flash Address Last Byte
*Memory Address++
*Memory Address++
...
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