參數(shù)資料
型號： AT89C51RC-24JU
廠商： Atmel
文件頁數(shù)： 14/36頁
文件大?。?/td> 0K
描述： IC 8051 MCU FLASH 32K 44PLCC
產(chǎn)品培訓(xùn)模塊： MCU Product Line Introduction
標(biāo)準(zhǔn)包裝： 27
系列： 89C
核心處理器： 8051
芯體尺寸： 8-位
速度： 24MHz
連通性： SPI，UART/USART
外圍設(shè)備： WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 32KB（32K x 8）
程序存儲器類型： 閃存
RAM 容量： 512 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-LCC（J 形引線）
包裝： 管件
配用： AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
21
1920D–MICRO–6/08
AT89C51RC
20. Program Memory Lock Bits
The AT89C51RC has three lock bits that can be left unprogrammed (U) or can be programmed
(P) to obtain the additional features listed in Table 20-1.
When lock bit 1 is programmed, the logic level at the EA pin is sampled and latched during reset.
If the device is powered up without a reset, the latch initializes to a random value and holds that
value until reset is activated. The latched value of EA must agree with the current logic level at
that pin in order for the device to function properly.
21. Programming the Flash
The AT89C51RC is shipped with the on-chip Flash memory array ready to be programmed. The
programming interface needs a high-voltage (12-volt) program enable signal and is compatible
with conventional third-party Flash or EPROM programmers.
The AT89C51RC code memory array is programmed byte-by-byte.
Programming Algorithm: Before programming the AT89C51RC, the address, data, and con-
trol signals should be set up according to Table 22-1 and Figures 22-1 and 22-2. To program the
AT89C51RC, take the following steps:
1.
Input the desired memory location on the address lines.
2.
Input the appropriate data byte on the data lines.
3.
Activate the correct combination of control signals.
4.
Raise EA/V
PP to 12V.
5.
Pulse ALE/PROG once to program a byte in the Flash array or the lock bits. The byte-
write cycle is self-timed and typically takes no more than 50 s. Repeat steps 1
through 5, changing the address and data for the entire array or until the end of the
object file is reached.
Table 20-1.
Lock Bit Protection Modes
Program Lock Bits
LB1
LB2
LB3
Protection Type
1
U
No program lock features
2P
U
MOVC instructions executed from external program memory
are disabled from fetching code bytes from internal memory,
EA is sampled and latched on reset, and further
programming of the Flash memory is disabled
3
P
U
Same as mode 2, but verify is also disabled
4
P
Same as mode 3, but external execution is also disabled
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT89C51RC-24JU SL383 制造商:Atmel Corporation 功能描述:
AT89C51RC-24PC 功能描述:8位微控制器 -MCU 32K FLASH 4.0 TO 5.5V - 24MHZ 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
AT89C51RC-24PI 功能描述:8位微控制器 -MCU 32K FLASH 4.0 TO 5.5V - 24MHZ 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
AT89C51RC-24PU 功能描述:8位微控制器 -MCU 32K FLASH 4.0 TO 5.5V 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
AT89C51RC2-DDW 功能描述:8位微控制器 -MCU Microcontroller 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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