參數(shù)資料
型號(hào)： PIC16LF84A
廠商： Microchip Technology Inc.
英文描述： 18-pin Enhanced Flash/EEPROM 8-Bit Microcontroller
中文描述： 18引腳增強(qiáng)型閃存/ EEPROM的8位微控制器
文件頁數(shù)： 20/68頁
文件大?。?/td> 494K
代理商： PIC16LF84A
PIC16F84A
DS35007A-page 20
Preliminary
1998 Microchip Technology Inc.
5.1
Reading the EEPROM Data Memory
To read a data memory location, the user must write the
address to the EEADR register and then set control bit
RD (EECON1<0>). The data is available, in the very
next cycle, in the EEDATA register; therefore it can be
read in the next instruction. EEDATA will hold this value
until another read or until it is written to by the user
(during a write operation).
EXAMPLE 5-1:
DATA EEPROM READ
BCF STATUS, RP0 ; Bank 0
MOVLW CONFIG_ADDR ;
MOVWF EEADR ; Address to read
BSF STATUS, RP0 ; Bank 1
BSF EECON1, RD ; EE Read
BCF STATUS, RP0 ; Bank 0
MOVF EEDATA, W ; W = EEDATA
5.2
Writing to the EEPROM Data Memory
To write an EEPROM data location, the user must first
write the address to the EEADR register and the data
to the EEDATA register. Then the user must follow a
specific sequence to initiate the write for each byte.
EXAMPLE 5-1:
DATA EEPROM WRITE
The write will not initiate if the above sequence is not
exactly followed (write 55h to EECON2, write AAh to
EECON2, then set WR bit) for each byte. We strongly
recommend that interrupts be disabled during this
code segment.
Additionally, the WREN bit in EECON1 must be set to
enable write. This mechanism prevents accidental
writes to data EEPROM due to errant (unexpected)
code execution (i.e., lost programs). The user should
keep the WREN bit clear at all times, except when
updating EEPROM. The WREN bit is not cleared
by hardware
After a write sequence has been initiated, clearing the
WREN bit will not affect this write cycle. The WR bit will
be inhibited from being set unless the WREN bit is set.
At the completion of the write cycle, the WR bit is
cleared in hardware and the EE Write Complete
Interrupt Flag bit (EEIF) is set. The user can either
enable this interrupt or poll this bit. EEIF must be
cleared by software.
5.3
Write Verify
Depending on the application, good programming prac-
tice may dictate that the value written to the Data
EEPROM should be verified (Example 5-1) to the
desired value to be written. This should be used in
applications where an EEPROM bit will be stressed
near the specification limit. The Total Endurance disk
will help determine your comfort level.
Generally the EEPROM write failure will be a bit which
was written as a '0', but reads back as a '1' (due to
leakage off the bit).
EXAMPLE 5-1:
WRITE VERIFY
BCF STATUS, RP0 ; Bank 0
: ; Any code can go here
: ;
MOVF EEDATA, W ; Must be in Bank 0
BSF STATUS, RP0 ; Bank 1
READ
BSF EECON1, RD ; YES, Read the
; value written
BCF STATUS, RP0 ; Bank 0
;
; Is the value written (in W reg) and
; read (in EEDATA) the same
;
SUBWF EEDATA, W ;
BTFSS STATUS, Z ; Is difference 0
GOTO WRITE_ERR ; NO, Write error
: ; YES, Good write
: ; Continue program
TABLE 5-1
REGISTERS/BITS ASSOCIATED WITH DATA EEPROM
BSF STATUS, RP0 ; Bank 1
BCF INTCON, GIE ; Disable INTs.
BSF EECON1, WREN ; Enable Write
MOVLW 55h ;
MOVWF EECON2 ; Write 55h
MOVLW AAh ;
MOVWF EECON2 ; Write AAh
BSF EECON1,WR ; Set WR bit
; begin write
BSF INTCON, GIE ; Enable INTs.
R
S
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
Power-on
Reset
Value on all
other resets
08h
EEDATA
EEPROM data register
xxxx xxxx
uuuu uuuu
09h
EEADR
EEPROM address register
xxxx xxxx
uuuu uuuu
88h
EECON1
—
—
—
EEIF
WRERR
WREN
WR
RD
---0 x000
---0 q000
89h
EECON2
EEPROM control register 2
---- ----
---- ----
Legend:
x
= unknown,
u
= unchanged,
-
= unimplemented read as '0',
q
= value depends upon condition. Shaded cells are not
used by data EEPROM.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16LF84A-04/P 功能描述:8位微控制器 -MCU 1.75KB 68 RAM 13 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(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
PIC16LF84A-04/P 制造商:Microchip Technology Inc 功能描述:8-Bit Microcontroller IC
PIC16LF84A-04/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 制造商:Microchip Technology Inc 功能描述:IC, 8BIT FLASH MCU
PIC16LF84A-04/SO 功能描述:8位微控制器 -MCU 1.75KB 68 RAM 13 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(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
PIC16LF84A-04/SS 功能描述:8位微控制器 -MCU 1.75KB 68 RAM 13 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(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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