AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 140

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

20.3.4.4
20.3.4.5
All lock bits must be deactivated before using the Full Erase command. This can be done by using the CLB
command.
Table 20-24. Full Erase Command
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 at the same time. Bit 0 of Bit Mask corresponds to the
first lock bit and so on.
In the same way, the Clear Lock command (CLB) is used to clear lock bits. All the lock bits can also be cleared by
the EA command.
Table 20-25. Set and Clear Lock Bit Command
Lock bits can be read using Get Lock Bit command (GLB). When a bit set in the Bit Mask is returned, then the cor-
responding lock bit is active.
Table 20-26. Get Lock Bit Command
General-purpose NVM bits (GP NVM) can be set with the Set GPNVM command (SGPB). Using this command,
several GP NVM bits can be activated at the same time. Bit 0 of Bit Mask corresponds to the first GPNVM bit and
so on.
In the same way, the Clear GPNVM command (CGPB) is used to clear GP NVM bits. All the general-purpose NVM
bits are also cleared by the EA command.
Table 20-27. Set and Clear General-purpose NVM Bit Command
GP NVM bits can be read using Get GPNVM Bit command (GGPB). When a bit set in the Bit Mask is returned,
then the corresponding GPNVM bit is set.
Table 20-28. Get General-purpose NVM Bit Command
Read/Write
Write
Read/Write
Write
Write
Read/Write
Write
Read
Read/Write
Write
Write
Read/Write
Write
Read
Flash Lock Commands
Flash General-purpose NVM Commands
DR Data
EA
DR Data
SLB or CLB
Bit Mask
DR Data
GLB
Bit Mask
DR Data
SGPB or CGPB
Bit Mask
DR Data
GGPB
Bit Mask
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
140