參數(shù)資料
型號: PIC16F877-20/PT
廠商: Microchip Technology
文件頁數(shù): 160/218頁
文件大?。?/td> 0K
描述: IC MCU FLASH 8KX14 EE 44TQFP
產(chǎn)品培訓模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標準包裝: 160
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 33
程序存儲器容量: 14KB(8K x 14)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量: 368 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: 0°C ~ 70°C
封裝/外殼: 44-TQFP
包裝: 托盤
配用: XLT44PT3-ND - SOCKET TRAN ICE 44MQFP/TQFP
AC164305-ND - MODULE SKT FOR PM3 44TQFP
444-1001-ND - DEMO BOARD FOR PICMICRO MCU
AC164020-ND - MODULE SKT PROMATEII 44TQFP
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁當前第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁
PIC16F87X
DS30292C-page 44
2001 Microchip Technology Inc.
4.4
Reading the FLASH Program
Memory
Reading FLASH program memory is much like that of
EEPROM data memory, only two NOP instructions must
be inserted after the RD bit is set. These two instruction
cycles that the NOP instructions execute, will be used
by the microcontroller to read the data out of program
memory
and
insert
the
value
into
the
EEDATH:EEDATA registers. Data will be available fol-
lowing the second NOP instruction. EEDATH and
EEDATA will hold their value until another read opera-
tion is initiated, or until they are written by firmware.
The steps to reading the FLASH program memory are:
1.
Write the address to EEADRH:EEADR. Make
sure that the address is not larger than the mem-
ory size of the PIC16F87X device.
2.
Set the EEPGD bit to point to FLASH program
memory.
3.
Set the RD bit to start the read operation.
4.
Execute two NOP instructions to allow the micro-
controller to read out of program memory.
5.
Read the data from the EEDATH:EEDATA
registers.
EXAMPLE 4-3:
FLASH PROGRAM READ
4.5
Writing to the FLASH Program
Memory
Writing to FLASH program memory is unique, in that
the microcontroller does not execute instructions while
programming is taking place. The oscillator continues
to run and all peripherals continue to operate and
queue interrupts, if enabled. Once the write operation
completes (specification D133), the processor begins
executing code from where it left off. The other impor-
tant difference when writing to FLASH program mem-
ory, is that the WRT configuration bit, when clear,
prevents any writes to program memory (see Table 4-1).
Just like EEPROM data memory, there are many steps
in writing to the FLASH program memory. Both address
and data values must be written to the SFRs. The
EEPGD bit must be set, and the WREN bit must be set
to enable writes. The WREN bit should be kept clear at
all times, except when writing to the FLASH Program
memory. The WR bit can only be set if the WREN bit
was set in a previous operation, i.e., they both cannot
be set in the same operation. The WREN bit should
then be cleared by firmware after the write. Clearing the
WREN bit before the write actually completes will not
terminate the write in progress.
Writes to program memory must also be prefaced with
a special sequence of instructions that prevent inad-
vertent write operations. This is a sequence of five
instructions that must be executed without interruption
for each byte written. These instructions must then be
followed by two NOP instructions to allow the microcon-
troller to setup for the write operation. Once the write is
complete, the execution of instructions starts with the
instruction after the second NOP.
The steps to write to program memory are:
1.
Write the address to EEADRH:EEADR. Make
sure that the address is not larger than the mem-
ory size of the PIC16F87X device.
2.
Write the 14-bit data value to be programmed in
the EEDATH:EEDATA registers.
3.
Set the EEPGD bit to point to FLASH program
memory.
4.
Set the WREN bit to enable program operations.
5.
Disable interrupts (if enabled).
6.
Execute the special five instruction sequence:
Write 55h to EECON2 in two steps (first to W,
then to EECON2)
Write AAh to EECON2 in two steps (first to W,
then to EECON2)
Set the WR bit
7.
Execute two NOP instructions to allow the micro-
controller to setup for write operation.
8.
Enable interrupts (if using interrupts).
9.
Clear the WREN bit to disable program
operations.
BSF
STATUS, RP1
;
BCF
STATUS, RP0
;Bank 2
MOVF
ADDRL, W
;Write the
MOVWF
EEADR
;address bytes
MOVF
ADDRH,W
;for the desired
MOVWF
EEADRH
;address to read
BSF
STATUS, RP0
;Bank 3
BSF
EECON1, EEPGD ;Point to Program memory
BSF
EECON1, RD
;Start read operation
NOP
;Required two NOPs
NOP
;
BCF
STATUS, RP0
;Bank 2
MOVF
EEDATA, W
;DATAL = EEDATA
MOVWF
DATAL
;
MOVF
EEDATH,W
;DATAH = EEDATH
MOVWF
DATAH
;
相關(guān)PDF資料
PDF描述
PIC18F6525-I/PT IC PIC MCU FLASH 24KX16 64TQFP
PIC16C74A-10/P IC MCU OTP 4KX14 A/D PWM 40DIP
PIC16C74A-20/P IC MCU OTP 4KX14 A/D PWM 40DIP
PIC16LF877-04I/L IC MCU FLASH 8KX14 EE A/D 44PLCC
PIC24EP256GU810-I/BG IC DSC 16B 256KB FLASH 121TFBGA
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16F877A DEV KIT W/PCW 功能描述:開發(fā)板和工具包 - PIC / DSPIC PIC16F877A EMBD C DEV KIT W/PCW RoHS:否 制造商:Microchip Technology 產(chǎn)品:Starter Kits 工具用于評估:chipKIT 核心:Uno32 接口類型: 工作電源電壓:
PIC16F877A DEV KIT W/PCWH 功能描述:開發(fā)板和工具包 - PIC / DSPIC PIC16F877A EMBD C DEV KIT W/PCWH RoHS:否 制造商:Microchip Technology 產(chǎn)品:Starter Kits 工具用于評估:chipKIT 核心:Uno32 接口類型: 工作電源電壓:
PIC16F877A DEVELOPMENT BOARD KIT 功能描述:DEVELOPMENT BOARD FOR PIC16F877A RoHS:否 類別:編程器,開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件(MCU、DSP、FPGA、CPLD等) 系列:- 標準包裝:1 系列:PICDEM™ 類型:MCU 適用于相關(guān)產(chǎn)品:PIC10F206,PIC16F690,PIC16F819 所含物品:板,線纜,元件,CD,PICkit 編程器 產(chǎn)品目錄頁面:659 (CN2011-ZH PDF)
PIC16F877A DEVELOPMENT KIT 功能描述:EMBEDDED C DEVELOPMENT KIT RoHS:否 類別:編程器,開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件(MCU、DSP、FPGA、CPLD等) 系列:PIC® 產(chǎn)品培訓模塊:Blackfin® Processor Core Architecture Overview Blackfin® Device Drivers Blackfin® Optimizations for Performance and Power Consumption Blackfin® System Services 特色產(chǎn)品:Blackfin? BF50x Series Processors 標準包裝:1 系列:Blackfin® 類型:DSP 適用于相關(guān)產(chǎn)品:ADSP-BF548 所含物品:板,軟件,4x4 鍵盤,光學撥輪,QVGA 觸摸屏 LCD 和 40G 硬盤 配用:ADZS-BFBLUET-EZEXT-ND - EZ-EXTENDER DAUGHTERBOARDADZS-BFLLCD-EZEXT-ND - BOARD EXT LANDSCAP LCD INTERFACE 相關(guān)產(chǎn)品:ADSP-BF542BBCZ-4A-ND - IC DSP 16BIT 400MHZ 400CSBGAADSP-BF544MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF542MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF542KBCZ-6A-ND - IC DSP 16BIT 600MHZ 400CSBGAADSP-BF547MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF548BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF547BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF544BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF542BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGA
PIC16F877A-BL 制造商:POWERLITE SYSTEMS 功能描述:BOOTLOADER PIC16F877A FOR FLASHLAB 制造商:POWERLITE SYSTEMS 功能描述:BOOTLOADER, PIC16F877A, FOR FLASHLAB