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参数资料
型号： PIC18F2321-E/SS
厂商： Microchip Technology
文件页数： 102/110页
文件大小： 0K
描述： IC PIC MCU FLASH 4KX16 28SSOP
产品培训模块： Asynchronous Stimulus
标准包装： 47
系列： PIC® 18F
核心处理器： PIC
芯体尺寸： 8-位
速度： 25MHz
连通性： I²C，SPI，UART/USART
外围设备： 欠压检测/复位，HLVD，POR，PWM，WDT
输入/输出数： 25
程序存储器容量： 8KB（4K x 16）
程序存储器类型： 闪存
EEPROM 大小： 256 x 8
RAM 容量： 512 x 8
电压 - 电源 (Vcc/Vdd)： 4.2 V ~ 5.5 V
数据转换器： A/D 10x10b
振荡器型： 内部
工作温度： -40°C ~ 125°C
封装/外壳： 28-SSOP（0.209"，5.30mm 宽）
包装： 管件
2009 Microchip Technology Inc.
DS39689F-page 91
PIC18F2221/2321/4221/4321 FAMILY
8.2
Reading the Data EEPROM
Memory
To read a data memory location, the user must write the
address to the EEADR register, clear the EEPGD
control bit (EECON1<7>) and then set control bit, RD
(EECON1<0>). The data is available on the very next
instruction cycle; therefore, the EEDATA register can
be read by the next instruction. EEDATA will hold this
value until another read operation, or until it is written to
by the user (during a write operation).
The basic process is shown in Example 8-1.
8.3
Writing to the Data EEPROM
Memory
To write an EEPROM data location, the address must
first be written to the EEADR register and the data
written to the EEDATA register. The sequence in
Example 8-2 must be followed to initiate the write cycle.
The write will not begin if this sequence is not exactly
followed (write 55h to EECON2, write 0AAh to
EECON2, then set WR bit) for each byte. It is strongly
recommended that interrupts be disabled during this
code segment.
Additionally, the WREN bit in EECON1 must be set to
enable writes. This mechanism prevents accidental
writes to data EEPROM due to unexpected code
execution (i.e., runaway programs). The WREN bit
should be kept clear at all times, except when updating
the EEPROM. The WREN bit is not cleared by
hardware.
After a write sequence has been initiated, EECON1,
EEADR and EEDATA cannot be modified. The WR bit
will be inhibited from being set unless the WREN bit is
set. The WREN bit must be set on a previous instruc-
tion. Both WR and WREN cannot be set with the same
instruction.
At the completion of the write cycle, the WR bit is
cleared in hardware and the EEPROM Interrupt Flag
bit, EEIF, is set. The user may either enable this
interrupt, or poll this bit. EEIF must be cleared by
software.
8.4
Write Verify
Depending on the application, good programming
practice may dictate that the value written to the mem-
ory should be verified against the original value. This
should be used in applications where excessive writes
can stress bits near the specification limit.
EXAMPLE 8-1:
DATA EEPROM READ
EXAMPLE 8-2:
DATA EEPROM WRITE
MOVLW
DATA_EE_ADDR
;
MOVWF
EEADR
; Data Memory Address to read
BCF
EECON1, EEPGD
; Point to DATA memory
BCF
EECON1, CFGS
; Access EEPROM
BSF
EECON1, RD
; EEPROM Read
MOVF
EEDATA, W
; W = EEDATA
MOVLW
DATA_EE_ADDR
;
MOVWF
EEADR
; Data Memory Address to write
MOVLW
DATA_EE_DATA
;
MOVWF
EEDATA
; Data Memory Value to write
BCF
EECON1, EEPGD
; Point to DATA memory
BCF
EECON1, CFGS
; Access EEPROM
BSF
EECON1, WREN
; Enable writes
BCF
INTCON, GIE
; Disable Interrupts
MOVLW
55h
;
Required
MOVWF
EECON2
; Write 55h
Sequence
MOVLW
0AAh
;
MOVWF
EECON2
; Write 0AAh
BSF
EECON1, WR
; Set WR bit to begin write
BTFSC
EECON1, WR
; Wait for write to complete
GOTO
$-2
BSF
INTCON, GIE
; Enable Interrupts
; User code execution
BCF
EECON1, WREN
; Disable writes on write complete (EEIF set)
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相关代理商/技术参数
参数描述
PIC18F2321-I/ML 功能描述:8位微控制器 -MCU 8 KB Flash 512 RAM 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
PIC18F2321-I/SO 功能描述:8位微控制器 -MCU 8 KB Flash 512 RAM 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
PIC18F2321-I/SP 功能描述:8位微控制器 -MCU 8 KB Flash 512 RAM 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
PIC18F2321-I/SP 制造商:Microchip Technology Inc 功能描述:8-Bit Microcontroller IC
PIC18F2321-I/SS 功能描述:8位微控制器 -MCU 8KB Flash 512bytes 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
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