參數(shù)資料
型號： PIC16F628A
廠商： Microchip Technology Inc.
英文描述： 18-pin Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology(18引腳，基于FLASH的8位CMOS微控制器，使用毫微瓦特技術)
中文描述： 18引腳基于閃存的8位CMOS微控制器與納瓦技術（18引腳，基于閃存的8位的CMOS微控制器，使用毫微瓦特技術）
文件頁數(shù)： 94/168頁
文件大?。?/td> 2756K
代理商： PIC16F628A
PIC16F627A/628A/648A
DS40044B-page 92
Preliminary
2004 Microchip Technology Inc.
13.7
Using the Data EEPROM
The data EEPROM is a high endurance, byte address-
able array that has been optimized for the storage of
frequently changing information (e.g., program
variables or other data that are updated often).
Frequently changing values will typically be updated
more often than specification D124. If this is not the
case, an array refresh must be performed.
For this reason, variables that change infrequently
(such as constants, IDs, calibration, etc.) should be
stored in Flash program memory.
A simple data EEPROM refresh routine is shown in
Example 13-4.
EXAMPLE 13-4:
DATA EEPROM REFRESH ROUTINE
13.8
DATA EEPROM OPERATION
DURING CODE PROTECT
When the device is code protected, the CPU is able to
read and write data to the Data EEPROM.
TABLE 13-1:
REGISTERS/BITS ASSOCIATED WITH DATA EEPROM
Note:
If data EEPROM is only used to store
constants and/or data that changes rarely,
an array refresh is likely not required. See
specification D124.
BANKSEL
CLRF
BCF
BSF
0X80
EEADR
INTCON, GIE
EECON1, WREN
;select Bank1
;start at address 0
;disable interrupts
;enable EE writes
Loop
BSF
MOVLW
MOVWF
MOVLW
MOVWF
BSF
BTFSC
GOTO
EECON1, RD
0x55
EECON2
0xAA
EECON2
EECON1, WR
EECON1, WR
$ - 1
;retrieve data into EEDATA
;first step of ...
;... required sequence
;second step of ...
;... required sequence
;start write sequence
;wait for write complete
#IFDEF __16F648A
;256 bytes in 16F648A
INCFSZ
EEADR, f
;test for end of memory
;128 bytes in 16F627A/628A
;next address
;test for end of memory
;end of conditional assembly
#ELSE
INCF
BTFSS
EEADR, f
EEADR, 7
#ENDIF
GOTO
Loop
;repeat for all locations
BCF
BSF
EECON1, WREN
INTCON, GIE
;disable EE writes
;enable interrupts (optional)
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
9Ah
9Bh
9Ch
9Dh
Legend:
EEDATA
EEADR
EECON1
EECON2
(1)
x = unknown, u = unchanged, - = unimplemented read as ‘0’, q = value depends upon condition.
Shaded cells are not used by data EEPROM.
EECON2 is not a physical register.
EEPROM data register
EEPROM address register
—
EEPROM control register 2
xxxx xxxx
xxxx xxxx
---- x000
---- ----
uuuu uuuu
uuuu uuuu
---- q000
---- ----
—
—
—
WRERR
WREN
WR
RD
Note
1:
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相關代理商/技術參數(shù)
參數(shù)描述
PIC16F628A-E/ML 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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
PIC16F628A-E/P 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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
PIC16F628A-E/SO 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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
PIC16F628A-E/SS 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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
PIC16F628A-I/ML 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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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