參數(shù)資料
型號(hào)： C8051F012
廠商： Cygnal Technologies
英文描述： 20 MIPS,32k Flash,256 Ram,10bit ADC,32 Pin MCU(20 MIPS,32k 閃速存儲(chǔ)器,256 Ram,10位 ADC,32 腳 MCU)
中文描述： 20 MIPS的，32K閃存，256羊，10位ADC，32引腳微控制器（20 MIPS的，32K的閃速存儲(chǔ)器，256，羊，10位ADC和32腳微控制器）
文件頁數(shù)： 86/170頁
文件大?。?/td> 1294K
代理商： C8051F012
Page 86
CYGNAL Integrated Products, Inc.
2001
4.2001; Rev. 1.3
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
PRELIMINARY
11. FLASH MEMORY
This MCUs include 32k + 128 bytes of on-chip, reprogrammable Flash memory for program code and non-volatile
data storage. The Flash memory can be programmed in-system, a single byte at a time, through the JTAG interface or
by software using the MOVX instruction. Once cleared to 0, a Flash bit must be erased to set it back to 1. The bytes
would typically be erased (set to 0xFF) before being reprogrammed. The write and erase operations are
automatically timed by hardware for proper execution. Data polling to determine the end of the write/erase operation
is not required. The Flash memory is designed to withstand at least 10,000 write/erase cycles. Refer to Table 11.1
for the electrical characteristics of the Flash memory.
11.1.
Programming The Flash Memory
The simplest means of programming the Flash memory is through the JTAG interface using programming tools
provided by Cygnal or a third party vendor. This is the only means for programming a non-initialized device. For
details on the JTAG commands to program Flash memory, see Section 21.2.
The Flash memory can be programmed by software using the MOVX instruction with the address and data byte to be
programmed provided as normal operands. Before writing to Flash memory using MOVX, Flash write operations
must be enabled by setting the PSWE Program Store Write Enable bit (PSCTL.0) to logic 1. Writing to Flash
remains enabled until the PSWE bit is cleared by software.
Writes to Flash memory can clear bits but cannot set them. Only an erase operation can set bits in Flash. Therefore,
the byte location to be programmed must be erased before a new value can be written. The 32kbyte Flash memory is
organized in 512-byte sectors. The erase operation applies to an entire sector (setting all bytes in the sector to 0xFF).
Setting the PSEE Program Store Erase Enable bit (PSCTL.1) and PSWE (PSCTL.0) bit to logic 1 and then using the
MOVX command to write a data byte to any byte location within the sector will erase an entire 512-byte sector. The
data byte written can be of any value because it is not actually written to the Flash. Flash erasure remains enabled
until the PSEE bit is cleared by software. The following sequence illustrates the algorithm for programming the
Flash memory by software:
1. Enable Flash Memory write/erase in FLSCL Register using FLASCL bits.
2. Set PSEE (PSCTL.1) to enable Flash sector erase.
3. Set PSWE (PSCTL.0) to enable Flash writes.
4. Use MOVX to write a data byte to any location within the 512-byte sector to be erased.
5. Clear PSEE to disable Flash sector erase.
6. Use MOVX to write a data byte to the desired byte location within the erased 512-byte sector. Repeat until
finished. (Any number of bytes can be written from a single byte to and entire sector.)
7. Clear the PSWE bit to disable Flash writes.
Write/Erase timing is automatically controlled by hardware based on the prescaler value held in the Flash Memory
Timing Prescaler register (FLSCL). The 4-bit prescaler value FLASCL determines the time interval for write/erase
operations. The FLASCL value required for a given system clock is shown in Figure 11.4, along with the formula
used to derive the FLASCL values. When FLASCL is set to 1111b, the write/erase operations are disabled. Note
that code execution in the 8051 is stalled while the Flash is being programmed or erased.
Table 11.1. FLASH Memory Electrical Characteristics
VDD = 2.7 to 3.6V, -40
°
C to +85
°
C unless otherwise specified.
PARAMETER
Endurance
Erase Cycle Time
CONDITIONS
MIN
10k
10
TYP
100k
MAX
UNITS
Erase/Wr
ms
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
C8051F012/005 制造商:Silicon Laboratories Inc 功能描述:
C8051F012-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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
C8051F012-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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
C8051F012-PX0005GQ 制造商:Silicon Laboratories Inc 功能描述:
C8051F012R 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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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