AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 110
AT91SAM7S256D-AU
Manufacturer Part Number
AT91SAM7S256D-AU
Description
ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
Manufacturer
Atmel
Series
SAM7S256r
Datasheet
1.AT91SAM7S256D-AU.pdf
(775 pages)
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
Available stocks
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Price
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Part Number:
AT91SAM7S256D-AU
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19.2.4.1
Figure 19-5. Command State Chart
In order to guarantee valid operations on the Flash memory, the field Flash Microsecond Cycle Number (FMCN) in
the Flash Mode Register MC_FMR must be correctly programmed (see
Several commands can be used to program the Flash.
The Flash technology requires that an erase must be done before programming. The entire memory plane can be
erased at the same time, or a page can be automatically erased by clearing the NEBP bit in the MC_FMR register
before writing the command in the MC_FCR register.
By setting the NEBP bit in the MC_FMR register, a page can be programmed in several steps if it has been erased
before (see
Flash Programming
Figure
19-6).
Write FCMD and PAGENB in MC_FCR
Check if PROGE flag set
Read Status: MC_FSR
Check if FRDY flag set
Read Status: MC_FSR
Check if FRDY flag set
Check if LOCKE flag set
Command Successful
Yes
Yes
No
No
No
No
Yes
Yes
Locking region violation
Bad keyword violation and/or Invalid command
“MC Flash Mode Register” on page
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
115).
110
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