参数资料
型号: C8051F018
厂商: Silicon Laboratories Inc
文件页数: 123/154页
文件大小: 0K
描述: IC 8051 MCU 16K FLASH 64TQFP
标准包装: 160
系列: C8051F018
核心处理器: 8051
芯体尺寸: 8-位
速度: 25MHz
连通性: SMBus(2 线/I²C),SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,温度传感器,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: 闪存
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.8 V ~ 3.6 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: 64-TQFP
包装: 托盘
C8051F018
C8051F019
9.2.
Non-volatile Data Storage
The Flash memory can be used for non-volatile data storage as well as program code. This allows data such as
calibration coefficients to be calculated and stored at run time. Data is written using the MOVX instruction and
read using the MOVC instruction.
9.3.
Security Options
The CIP-51 provides security options to protect the Flash memory from inadvertent modification by software as
well as prevent the viewing of proprietary program code and constants.
The Program Store Write Enable
(PSCTL.0) and the Program Store Erase Enable (PSCTL.1) bits protect the Flash memory from accidental
modification by software. These bits must be explicitly set to logic 1 before software can modify the Flash memory.
Additional security features prevent proprietary program code and data constants from being read or altered across
the JTAG interface or by software running on the system controller.
A set of security lock bytes stored at 0x3DFE and 0x3DFF protect the Flash program memory from being read or
altered across the JTAG interface. Each bit in a security lock-byte protects one 4kbyte block of memory. Clearing
a bit to logic 0 in a Read lock byte prevents the corresponding block of Flash memory from being read across the
JTAG interface. Clearing a bit in the Write/Erase lock byte protects the block from JTAG erasures and/or writes.
The Read lock byte is at location 0x3DFF. The Write/Erase lock byte is located at 0x3DFE. Figure 9.2 shows the
location and bit definitions of the security bytes. The 512-byte sector containing the lock bytes can be written to,
but not erased by software. Writing to the reserved area should not be performed.
Figure 9.1. PSCTL: Program Store RW Control
R/W
Reset Value
-
PSEE
PSWE
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address:
0x8F
Bits7-2: UNUSED. Read = 000000b, Write = don’t care.
Bit1:
PSEE: Program Store Erase Enable.
Setting this bit allows an entire page of the Flash program memory to be erased provided
the PSWE bit is also set. After setting this bit, a write to Flash memory using the MOVX
instruction will erase the entire page that contains the location addressed by the MOVX
instruction. The value of the data byte written does not matter.
0: Flash program memory erasure disabled.
1: Flash program memory erasure enabled.
Bit0:
PSWE: Program Store Write Enable.
Setting this bit allows writing a byte of data to the Flash program memory using the
MOVX instruction. The location must be erased before writing data.
0: Write to Flash program memory disabled.
1: Write to Flash program memory enabled.
Rev. 1.2
70
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