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參數(shù)資料
| 型號： | C8051F017 |
| 廠商： | Cygnal Technologies |
| 英文描述： | 25 MIPS,32k Flash,2.25k Ram,10bit ADC,32 Pin MCU(25 MIPS,32k 閃速存儲器,2.25k Ram,10位 ADC,32 腳 MCU) |
| 中文描述： | 25 MIPS的，32K閃存，2.25k羊，10位ADC，32引腳微控制器（25 MIPS的，32K的閃速存儲器，2.25k羊，10位ADC和32腳微控制器） |
| 文件頁數(shù)： | 87/170頁 |
| 文件大?。?/td> | 1294K |
| 代理商： | C8051F017 |
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4.2001; Rev. 1.3
CYGNAL Integrated Products, Inc.
2001
Page 87
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
PRELIMINARY
11.2.
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.
The MCU incorporates an additional 128-byte sector of Flash memory located at 0x8000 – 0x807F. This sector can
be used for program code or data storage. However, its smaller sector size makes it particularly well suited as general
purpose, non-volatile scratchpad memory. Even though Flash memory can be written a single byte at a time, an
entire sector must be erased first. In order to change a single byte of a multi-byte data set, the data must be moved to
temporary storage. Next, the sector is erased, the data set updated and the data set returned to the original sector.
The 128-byte sector-size facilitates updating data without wasting program memory space by allowing the use of
internal data RAM for temporary storage. (A normal 512-byte sector is too large to be stored in the 256-byte internal
data memory.)
11.3.
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 0x7DFE and 0x7DFF 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 0x7DFF. The Write/Erase lock byte is located at 0x7DFE. Figure 11.2 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.
Non-volatile Data Storage
Figure 11.1. PSCTL: Program Store RW Control
R/W
-
Bit7
R/W
-
Bit6
R/W
-
Bit5
R/W
-
Bit4
R/W
-
Bit3
R/W
-
Bit2
R/W
PSEE
Bit1
R/W
PSWE
Bit0
Reset Value
00000000
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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| C8051F017-GQ | 功能描述:8位微控制器 -MCU 32KB 10ADC 32P MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| C8051F017-GQR | 功能描述:8位微控制器 -MCU 32KB 10ADC 32Pin MCU Tape and Reel RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| C8051F017R | 功能描述:8位微控制器 -MCU C +-10Bit 32Pin RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| C8051F018 | 功能描述:8位微控制器 -MCU 16KB 10ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| C8051F018-GQ | 功能描述:8位微控制器 -MCU 16KB 10ADC 64P MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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