参数资料
型号: AT91SAM7S32B-MU-999
厂商: Atmel
文件页数: 48/165页
文件大小: 0K
描述: IC MCU ARM7 32KB FLASH 48-VQFN
产品培训模块: MCU Product Line Introduction
标准包装: 3,500
系列: SAM7S
核心处理器: ARM7
芯体尺寸: 16/32-位
速度: 55MHz
连通性: I²C,SPI,SSC,UART/USART
外围设备: 欠压检测/复位,DMA,POR,PWM,WDT
输入/输出数: 21
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
RAM 容量: 8K x 8
电压 - 电源 (Vcc/Vdd): 1.65 V ~ 1.95 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 48-VFQFN 裸露焊盘
包装: 带卷 (TR)
配用: AT91SAM-ICE-ND - EMULATOR FOR AT91 ARM7/ARM9
AT91SAM7S-EK-ND - KIT EVAL FOR ARM AT91SAM7S
141
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
20.3.4.6
Flash Security Bit Command
Security bits can be set using Set Security Bit command (SSE). Once the security bit is active, the Fast Flash pro-
gramming 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 SAM7S512 security bit is controlled by the EFC0. To use the Set Security Bit command, the EFC0 must be
selected using the Select EFC 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:
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
Then it is possible to return to FFPI mode and check that Flash is erased.
20.3.4.7
SAM7S512 Select EFC Command
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 20-29. Set Security Bit Command
Read/Write
DR Data
Write
SSE
Table 20-30. Select EFC Command
Step
Handshake Sequence
MODE[3:0]
DATA[15:0]
1
Write handshaking
CMDE
SEFC
2
Write handshaking
DATA
0 = Select EFC0
1 = Select EFC1
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