AT91SAM7S161-AU Atmel, AT91SAM7S161-AU Datasheet - Page 141
![IC MCU ARM7 16KB FLASH 64LQFP](/photos/12/13/121332/313-64-tqfp_sml.jpg)
AT91SAM7S161-AU
Manufacturer Part Number
AT91SAM7S161-AU
Description
IC MCU ARM7 16KB FLASH 64LQFP
Manufacturer
Atmel
Series
AT91SAMr
Specifications of AT91SAM7S161-AU
Core Processor
ARM7
Core Size
16/32-Bit
Speed
55MHz
Connectivity
I²C, SPI, SSC, UART/USART, USB
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.65 V ~ 1.95 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-LQFP
For Use With
AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9AT91SAM7S-EK - KIT EVAL FOR ARM AT91SAM7S
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
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Manufacturer
Quantity
Price
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Part Number:
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20.3.4.6
20.3.4.7
6175K–ATARM–30-Aug-10
Flash Security Bit Command
AT91SAM7S512 Select EFC 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
Security bits can be set using Set Security Bit command (SSE). Once the security bit is active,
the Fast Flash programming is disabled. No other command can be run. Only an event on the
Erase pin can erase the security bit once the contents of the Flash have been erased.
The AT91SAM7S512 security bit is controlled by the EFC0. To use the Set Security Bit com-
mand, the EFC0 must be selected using the Select EFC command.
Table 20-29. Set Security Bit Command
Once the security bit is set, it is not possible to access FFPI. The only way to erase the security
bit is to erase the Flash.
In order to erase the Flash, the user must perform the following:
Then it is possible to 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 20-30. Select EFC Command
Read/Write
Write
Read
Read/Write
Write
Step
1
2
• 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
Handshake Sequence
Write handshaking
Write handshaking
DR Data
GGPB
Bit Mask
DR Data
SSE
AT91SAM7S Series Preliminary
MODE[3:0]
CMDE
DATA
DATA[15:0]
SEFC
0 = Select EFC0
1 = Select EFC1
141
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