AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 134

• 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

20.2.5.7
20.2.5.8
Then it is possible o return to FFPI mode and check that Flash is erased.
The commands WPx, EA, xLB, xFB are executed using the current EFC controller. The default EFC controller is
EFC0. The Select EFC command (SEFC) allows selection of the current EFC controller.
Table 20-16. Select EFC Command
This command is used to perform a write access to any memory location.
The Memory Write command (WRAM) is optimized for consecutive writes. Write handshaking can be chained; an
internal address buffer is automatically increased.
Table 20-17. Write Command
Table 20-18. Write Command
Step
1
2
Step
1
2
3
4
5
...
n
n+1
n+2
n+3
...
Step
1
2
3
4
5
• Power-off the chip
• Power-on the chip with TST = 0
• Assert Erase during a period of more than 220 ms
• Power-off the chip
SAM7S512 Select EFC Command
Memory Write Command
Handshake Sequence
Write handshaking
Write handshaking
Handshake Sequence
Write handshaking
Write handshaking
Write handshaking
Write handshaking
Write handshaking
...
Write handshaking
Write handshaking
Write handshaking
Write handshaking
...
Handshake Sequence
Write handshaking
Write handshaking
Write handshaking
Write handshaking
Write handshaking
MODE[3:0]
ADDR0
ADDR1
ADDR2
ADDR3
MODE[3:0]
CMDE
ADDR0
ADDR1
DATA
DATA
...
ADDR0
ADDR1
DATA
DATA
...
CMDE
MODE[3:0]
CMDE
DATA
DATA[7:0]
WRAM
Memory Address LSB
Memory Address
Memory Address
Memory Address
DATA[15:0]
...
...
WRAM
Memory Address LSB
Memory Address
*Memory Address++
*Memory Address++
Memory Address LSB
Memory Address
*Memory Address++
*Memory Address++
DATA[15:0]
0 = Select EFC0
1 = Select EFC1
SEFC
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
134