AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 131

• 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

20.2.5.2
Table 20-7.
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 corre-
sponds to a Flash memory page. The load buffer is automatically flushed to the Flash:
The Write Page command (WP) is optimized for consecutive writes. Write handshaking can be chained; an inter-
nal address buffer is automatically increased.
Table 20-8.
Table 20-9.
Step
n+2
n+3
n+4
n+5
...
Step
1
2
3
4
5
...
n
n+1
n+2
n+3
...
Step
1
2
3
4
5
6
7
• before access to any page other than the current one
• when a new command is validated (MODE = CMDE)
Flash Write Command
Handshake Sequence
Write handshaking
Write handshaking
Read handshaking
Read 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
Write handshaking
Write handshaking
Read Command (Continued)
Write Command
Write Command
MODE[3:0]
CMDE
ADDR0
ADDR1
DATA
DATA
...
ADDR0
ADDR1
DATA
DATA
...
MODE[3:0]
CMDE
ADDR0
ADDR1
ADDR2
ADDR3
DATA
DATA
MODE[3:0]
ADDR2
ADDR3
DATA
DATA
...
DATA[15:0]
WP or WPL or EWP or EWPL
...
...
DATA[7:0]
WP or WPL or EWP or EWPL
Memory Address LSB
Memory Address
Memory Address
Memory Address
*Memory Address++
*Memory Address++
Memory Address LSB
Memory Address
*Memory Address++
*Memory Address++
Memory Address LSB
Memory Address
*Memory Address++
*Memory Address++
Memory Address
Memory Address
*Memory Address++
*Memory Address++
...
DATA[7:0]
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
131