SAM7SE256 Atmel Corporation, SAM7SE256 Datasheet - Page 122

• 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

20.2.4.2
Table 20-5.
122
Step
1
2
3
4
5
6
7
8
9
10
11
12
13
SAM7SE512/256/32
Programmer Action
Sets MODE and DATA signals
Clears NCMD signal
Waits for RDY low
Sets DATA signal in tristate
Clears NOE signal
Waits for NVALID low
Reads value on DATA Bus
Sets NOE signal
Waits for NVALID high
Sets DATA in output mode
Sets NCMD signal
Waits for RDY high
Read Handshaking
Read Handshake
For details on the read handshaking sequence, refer to
Figure 20-3.
MODE[3:0]
DATA[15:0]
NVALID
NCMD
Parallel Programming Timing, Read Sequence
NOE
RDY
1
Device Action
Waits for NCMD low
Latch MODE and DATA
Clears RDY signal
Waits for NOE Low
Sets DATA bus in output mode and outputs
the flash contents.
Clears NVALID signal
Waits for NOE high
Sets DATA bus in input mode
Sets NVALID signal
Waits for NCMD high
Sets RDY signal
2
Adress IN
ADDR
3
4
5
Z
6
Figure 20-3
7
Data OUT
8
9
and
DATA I/O
Input
Input
Input
Input
Tristate
Output
Output
Output
Output
X
Input
Input
Input
10
11
Table
X
12
6222F–ATARM–14-Jan-11
20-5.
13
IN