AT91SAM7L64-AU Atmel, AT91SAM7L64-AU Datasheet - Page 27
![MCU ARM7 64K HS FLASH 128-LQFP](/photos/6/71/67112/128-lqfp_sml.jpg)
AT91SAM7L64-AU
Manufacturer Part Number
AT91SAM7L64-AU
Description
MCU ARM7 64K HS FLASH 128-LQFP
Manufacturer
Atmel
Series
AT91SAMr
Specifications of AT91SAM7L64-AU
Core Processor
ARM7
Core Size
16/32-Bit
Speed
36MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
80
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
6K x 8
Voltage - Supply (vcc/vdd)
1.55 V ~ 1.8 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
128-LQFP
Controller Family/series
AT91SAM7xxx
No. Of I/o's
80
Ram Memory Size
6KB
Cpu Speed
36MHz
No. Of Timers
1
Rohs Compliant
Yes
Processor Series
AT91SAMx
Core
ARM7TDMI
Data Bus Width
32 bit
Data Ram Size
6 KB
Interface Type
2-Wire, SPI, USART
Maximum Clock Frequency
36 MHz
Number Of Programmable I/os
80
Number Of Timers
3
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
JTRACE-ARM-2M, MDK-ARM, RL-ARM, ULINK2
Development Tools By Supplier
AT91SAM-ICE, AT91-ISP, AT91SAM7L-EK
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 4 Channel
For Use With
AT91SAM7L-STK - KIT EVAL FOR AT91SAM7LAT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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- Download datasheet (9Mb)
8.1.2.3
8.1.2.4
8.1.2.5
8.1.2.6
6257A–ATARM–20-Feb-08
Enhanced Embedded Flash Controller
Lock Regions
Security Bit Feature
Calibration Bits
The Enhanced Embedded Flash Controller (EEFC) manages accesses performed by the mas-
ters of the system. It enables reading the Flash and writing the write buffer. It also contains a
User Interface, mapped within the Memory Controller on the APB.
The Enhanced Embedded Flash Controller ensures the interface of the Flash block with the 32-
bit internal bus. Its 128-bit wide memory interface increases performance. It also manages the
programming, erasing, locking and unlocking sequences of the Flash using a full set of com-
mands. One of the commands returns the embedded Flash descriptor definition that informs the
system about the Flash organization, thus making the software generic.
The AT91SAM7L128 Embedded Flash Controller manages 16 lock bits to protect 16 regions of
the flash against inadvertent flash erasing or programming commands. The AT91SAM7L128
contains 16 lock regions and each lock region contains 32 pages of 256 bytes. Each lock region
has a size of 8 Kbytes.
The AT91SAM7L64 Embedded Flash Controller manages 8 lock bits to protect 8 regions of the
flash against inadvertent flash erasing or programming commands. The AT91SAM7L64 con-
tains 8 lock regions and each lock region contains 32 pages of 256 bytes. Each lock region has
a size of 8 Kbytes.
If a locked-region’s erase or program command occurs, the command is aborted and the EEFC
triggers an interrupt.
The 16 NVM bits are software programmable through the EEFC User Interface. The command
“Set Lock Bit” enables the protection. The command “Clear Lock Bit” unlocks the lock region.
Asserting the ERASE pin clears the lock bits, thus unlocking the entire Flash.
The AT91SAM7L128/64 features a security bit, based on a specific General Purpose NVM bit
(GPNVM bit 0). When the security is enabled, any access to the Flash, either through the ICE
interface or through the Fast Flash Programming Interface, is forbidden. This ensures the confi-
dentiality of the code programmed in the Flash.
This security bit can only be enabled, through the command “Set General Purpose NVM Bit 0” of
the EEFC User Interface. Disabling the security bit can only be achieved by asserting the
ERASE pin at 1, and after a full Flash erase is performed. When the security bit is deactivated,
all accesses to the Flash are permitted.
It is important to note that the assertion of the ERASE pin should always be longer than 200 ms.
As the ERASE pin integrates a permanent pull-down, it can be left unconnected during normal
operation. However, it is safer to connect it directly to GND for the final application.
NVM bits are used to calibrate the brownout detector and the voltage regulator. These bits are
factory configured and cannot be changed by the user. The ERASE pin has no effect on the cal-
ibration bits.
AT91SAM7L128/64 Preliminary
27
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