SAM7SE256 Atmel Corporation, SAM7SE256 Datasheet - Page 125

• 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

20.2.5.4
20.2.5.5
6222F–ATARM–14-Jan-11
Flash Lock Commands
Flash General-purpose NVM Commands
Lock bits can be set using WPL or EWPL commands. They can also be set by using the Set
Lock command (SLB). With this command, several lock bits can be activated. A Bit Mask is pro-
vided as argument to the command. When bit 0 of the bit mask is set, then the first lock bit is
activated.
In the same way, the Clear Lock command (CLB) is used to clear lock bits. All the lock bits are
also cleared by the EA command.
Table 20-9.
Lock bits can be read using Get Lock Bit command (GLB). The n
n of the bit mask is set..
Table 20-10. Get Lock Bit Command
General-purpose NVM bits (GP NVM bits) can be set using the Set Fuse command (SFB). This
command also activates GP NVM bits. A bit mask is provided as argument to the command.
When bit 0 of the bit mask is set, then the first GP NVM bit is activated.
In the same way, the Clear Fuse command (CFB) is used to clear general-purpose NVM bits.
All the general-purpose NVM bits are also cleared by the EA command. The general-purpose
NVM bit is deactivated when the corresponding bit in the pattern value is set to 1.
Table 20-11. Set/Clear GP NVM Command
General-purpose NVM bits can be read using the Get Fuse Bit command (GFB). The n
NVM bit is active when bit n of the bit mask is set..
Table 20-12. Get GP NVM Bit Command
Step
1
2
Step
1
2
Step
1
2
Step
1
2
Handshake Sequence
Write handshaking
Write handshaking
Handshake Sequence
Write handshaking
Read handshaking
Handshake Sequence
Write handshaking
Write handshaking
Handshake Sequence
Write handshaking
Read handshaking
Set and Clear Lock Bit Command
MODE[3:0]
CMDE
DATA
MODE[3:0]
CMDE
DATA
MODE[3:0]
CMDE
DATA
MODE[3:0]
CMDE
DATA
SAM7SE512/256/32
DATA[15:0]
SLB or CLB
Bit Mask
DATA[15:0]
Lock Bit Mask Status
0 = Lock bit is cleared
1 = Lock bit is set
DATA[15:0]
DATA[15:0]
GFB
GP NVM Bit Mask Status
0 = GP NVM bit is cleared
1 = GP NVM bit is set
GLB
SFB or CFB
GP NVM bit pattern value
th
lock bit is active when the bit
th
125
GP