參數(shù)資料
型號： AT89LP428-20PU
廠商： Atmel
文件頁數(shù)： 35/149頁
文件大?。?/td> 0K
描述： MCU 8051 4K FLASH SPI 28PDIP
產品培訓模塊： MCU Product Line Introduction
標準包裝： 14
系列： 89LP
核心處理器： 8051
芯體尺寸： 8-位
速度： 20MHz
連通性： SPI，UART/USART
外圍設備： 欠壓檢測/復位，POR，PWM，WDT
輸入/輸出數(shù)： 30
程序存儲器容量： 4KB（4K x 8）
程序存儲器類型： 閃存
EEPROM 大?。?/td> 512 x 8
RAM 容量： 768 x 8
電壓 - 電源 (Vcc/Vdd)： 2.4 V ~ 5.5 V
振蕩器型： 內部
工作溫度： -40°C ~ 85°C
封裝/外殼： 28-DIP（0.300"，7.62mm）
包裝： 管件
13
3654A–MICRO–8/09
AT89LP428/828
Figure 3-4.
FDATA Byte Write
Figure 3-5.
FDATA Page Write
The auto-erase bit AERS (MEMCON.6) can be set to one to perform a page erase automatically
at the beginning of any write sequence. The page erase will erase the entire page and then the
bytes in the temporary buffer will be written to the selected page.
Frequently just a few bytes within a page must be updated while maintaining the state of the
other bytes. There are two options for handling this situation that allow the Flash data memory to
emulate a traditional EEPROM memory. The simplest method is to copy the entire page into a
buffer allocated in RAM, modify the desired byte locations in the RAM buffer, and then load and
write back the page to the Flash memory. This option requires that at least one page size of
RAM is available as a temporary buffer. The second option is to load the unmodified bytes of the
page directly into the Flash memory’s temporary load buffer before loading the updated values
of the modified bytes. For example, if just one byte needs modification, the user must first read
and load the unaffected bytes of into the page buffer. Then the modified byte value is stored to
the page buffer before starting the auto-erase sequence. This method reduces the amount of
RAM required; however, more software overhead is needed because the read-and-load-back
routine must skip those bytes in the page that need to be updated in order to prevent those loca-
tions in the buffer from being loaded with the previous data, as this will block the new data from
being loaded correctly.
A write sequence will not occur if the Brown-out Detector (BOD) is active, even if the BOD reset
has been disabled. In cases where the BOD reset is disabled, the user should check the BOD
status by reading the WRTINH bit in MEMCON. If a write currently in progress is interrupted by
the BOD due to a low voltage condition, the ABORT flag will be set. FDATA can always be read
regardless of the BOD state.
For more details on using the Flash Data Memory, see the application note titled “AT89LP Flash
Data Memory”. FDATA may also be programmed by an external device programmer (see “Pro-
MWEN
DMEN
t
WC
LDPG
IDLE
MOVX
t
WC
MWEN
DMEN
t
WC
LDPG
IDLE
MOVX
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AT89LP51-20AU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL 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 安裝風格:SMD/SMT
AT89LP51-20JU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL 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 安裝風格:SMD/SMT
AT89LP51-20MU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL 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 安裝風格:SMD/SMT
AT89LP51-20PU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL 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 安裝風格:SMD/SMT
AT89LP51ED2-20AAU 功能描述:8位微控制器 -MCU 64KB 20MHz 2.4V-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 安裝風格:SMD/SMT
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