收藏本站
参数资料
型号： PIC16F871-I/PT
厂商： Microchip Technology
文件页数： 69/143页
文件大小： 0K
描述： IC MCU FLASH 2KX14 EE 44TQFP
产品培训模块： Asynchronous Stimulus
标准包装： 160
系列： PIC® 16F
核心处理器： PIC
芯体尺寸： 8-位
速度： 20MHz
连通性： UART/USART
外围设备： 欠压检测/复位，POR，PWM，WDT
输入/输出数： 33
程序存储器容量： 3.5KB（2K x 14）
程序存储器类型： 闪存
EEPROM 大小： 64 x 8
RAM 容量： 128 x 8
电压 - 电源 (Vcc/Vdd)： 4 V ~ 5.5 V
数据转换器： A/D 8x10b
振荡器型： 外部
工作温度： -40°C ~ 85°C
封装/外壳： 44-TQFP
包装： 托盘
配用： I3-DB16F871-ND - BOARD DAUGHTER ICEPIC3
2003 Microchip Technology Inc.
DS30569B-page 29
PIC16F870/871
3.3
Reading the EEPROM Data
Memory
Reading EEPROM data memory only requires that the
desired address to access be written to the EEADR
register and clear the EEPGD bit. After the RD bit is set,
data will be available in the EEDATA register on the
very next instruction cycle. EEDATA will hold this value
until another read operation is initiated or until it is
written by firmware.
The steps to reading the EEPROM data memory are:
1.
Write the address to EEDATA. Make sure that
the address is not larger than the memory size
of the PIC16F870/871 devices.
2.
Clear the EEPGD bit to point to EEPROM data
memory.
3.
Set the RD bit to start the read operation.
4.
Read the data from the EEDATA register.
EXAMPLE 3-1:
EEPROM DATA READ
3.4
Writing to the EEPROM Data
Memory
There are many steps in writing to the EEPROM data
memory. Both address and data values must be written
to the SFRs. The EEPGD bit must be cleared, 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 EEPROM data. 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 EEPROM data memory must also be pref-
aced with a special sequence of instructions that pre-
vent inadvertent write operations. This is a sequence of
five instructions that must be executed without interrup-
tions. The firmware should verify that a write is not in
progress before starting another cycle.
The steps to write to EEPROM data memory are:
1.
If step 10 is not implemented, check the WR bit
to see if a write is in progress.
2.
Write the address to EEADR. Make sure that the
address is not larger than the memory size of
the PIC16F870/871 devices.
3.
Write the 8-bit data value to be programmed in
the EEDATA register.
4.
Clear the EEPGD bit to point to EEPROM data
memory.
5.
Set the WREN bit to enable program operations.
6.
Disable interrupts (if enabled).
7.
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
8.
Enable interrupts (if using interrupts).
9.
Clear the WREN bit to disable program
operations.
10. 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.) If step 1 is
not implemented, then firmware should check
for EEIF to be set, or WR to clear, to indicate the
end of the program cycle.
EXAMPLE 3-2:
EEPROM DATA WRITE
BSF
STATUS, RP1
;
BCF
STATUS, RP0
;Bank 2
MOVF
ADDR, W
;Write address
MOVWF
EEADR
;to read from
BSF
STATUS, RP0
;Bank 3
BCF
EECON1, EEPGD
;Point to Data memory
BSF
EECON1, RD
;Start read operation
BCF
STATUS, RP0
;Bank 2
MOVF
EEDATA, W
;W = EEDATA
BSF
STATUS, RP1
;
BSF
STATUS, RP0
;Bank 3
BTFSC EECON1, WR
;Wait for
GOTO
$-1
;write to finish
BCF
STATUS, RP0
;Bank 2
MOVF
ADDR, W
;Address to
MOVWF EEADR
;write to
MOVF
VALUE, W
;Data to
MOVWF EEDATA
;write
BSF
STATUS, RP0
;Bank 3
BCF
EECON1, EEPGD ;Point to Data 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
;Only enable interrupts
BSF
INTCON, GIE
;if using interrupts,
;otherwise discard
BCF
EECON1, WREN
;Disable writes
相关PDF资料
PDF描述
PIC16C71-04I/SO IC MCU OTP 1KX14 A/D 18SOIC
PIC18F4423-E/P IC PIC MCU FLASH 8KX16 40DIP
GRM31CR61C475KA01K CAP CER 4.7UF 16V 10% X5R 1206
VI-25B-CV-F4 CONVERTER MOD DC/DC 95V 150W
PIC16C56-XTI/SS IC MCU OTP 1KX12 20SSOP
相关代理商/技术参数
参数描述
PIC16F871T-E/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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16F871T-E/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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格: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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格: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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*