參數(shù)資料
型號： PIC16F871T-E/L
廠商： Microchip Technology
文件頁數(shù)： 71/143頁
文件大小： 0K
描述： IC MCU CMOS 20MHZ 2K FLSH 44PLCC
標準包裝： 500
系列： PIC® 16F
核心處理器： PIC
芯體尺寸： 8-位
速度： 20MHz
連通性： UART/USART
外圍設備： 欠壓檢測/復位，POR，PWM，WDT
輸入/輸出數(shù)： 33
程序存儲器容量： 3.5KB（2K x 14）
程序存儲器類型： 閃存
EEPROM 大?。?/td> 64 x 8
RAM 容量： 128 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x10b
振蕩器型： 外部
工作溫度： -40°C ~ 125°C
封裝/外殼： 44-LCC（J 形引線）
包裝： 帶卷 (TR)
2003 Microchip Technology Inc.
DS30569B-page 31
PIC16F870/871
At the completion of the write cycle, the WR bit is
cleared and the EEIF interrupt flag bit is set. (EEIF
must be cleared by firmware.) Since the microcontroller
does not execute instructions during the write cycle, the
firmware does not necessarily have to check either
EEIF, or WR, to determine if the write had finished.
EXAMPLE 3-4:
FLASH PROGRAM WRITE
3.7
Write Verify
The PIC16F870/871 devices do not automatically ver-
ify the value written during a write operation. Depend-
ing on the application, good programming practice may
dictate that the value written to memory be verified
against the original value. This should be used in appli-
cations where excessive writes can stress bits near the
specified endurance limits.
3.8
Protection Against Spurious
Writes
There are conditions when the device may not want to
write to the EEPROM data memory or FLASH program
memory. To protect against these spurious write condi-
tions, various mechanisms have been built into the
PIC16F870/871 devices. On power-up, the WREN bit
is cleared and the Power-up Timer (if enabled)
prevents writes.
The write initiate sequence and the WREN bit together,
help prevent any accidental writes during brown-out,
power glitches, or firmware malfunction.
3.9
Operation While Code Protected
The PIC16F870/871 devices have two code protect
mechanisms, one bit for EEPROM data memory and
two bits for FLASH program memory. Data can be read
and written to the EEPROM data memory, regardless
of the state of the code protection bit, CPD. When code
protection is enabled and CPD cleared, external
access via ICSP is disabled, regardless of the state of
the program memory code protect bits. This prevents
the contents of EEPROM data memory from being read
out of the device.
The state of the program memory code protect bits,
CP0 and CP1, do not affect the execution of instruc-
tions out of program memory. The PIC16F870/871
devices can always read the values in program mem-
ory, regardless of the state of the code protect bits.
However, the state of the code protect bits and the
WRT bit will have different effects on writing to program
memory. Table 4-1 shows the effect of the code protect
bits and the WRT bit on program memory.
Once code protection has been enabled for either
EEPROM data memory or FLASH program memory,
only a full erase of the entire device will disable code
protection.
BSF
STATUS, RP1
;
BCF
STATUS, RP0
;Bank 2
MOVF
ADDRL, W
;Write address
MOVWF
EEADR
;of desired
MOVF
ADDRH, W
;program memory
MOVWF
EEADRH
;location
MOVF
VALUEL, W
;Write value to
MOVWF
EEDATA
;program at
MOVF
VALUEH, W
;desired memory
MOVWF
EEDATH
;location
BSF
STATUS, RP0
;Bank 3
BSF
EECON1, EEPGD ;Point to Program memory
BSF
EECON1, WREN
;Enable writes
;Only disable interrupts
BCF
INTCON, GIE
;if already enabled,
;otherwise discard
MOVLW
0x55
;Write 55h to
MOVWF
EECON2
;EECON2
MOVLW
0xAA
;Write AAh to
MOVWF
EECON2
;EECON2
BSF
EECON1, WR
;Start write operation
NOP
;Two NOPs to allow micro
NOP
;to setup for write
;Only enable interrupts
BSF
INTCON, GIE
;if using interrupts,
;otherwise discard
BCF
EECON1, WREN
;Disable writes
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相關代理商/技術參數(shù)
參數(shù)描述
PIC16F871T-I/L 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 33 I/O 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
PIC16F871T-I/PT 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 33 I/O 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
PIC16F872-E/SO 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O 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
PIC16F872-E/SOVAO 制造商:Microchip Technology Inc 功能描述:
PIC16F872-E/SP 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O 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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