參數資料
型號： PIC18F448-E/PT
廠商： Microchip Technology
文件頁數： 77/116頁
文件大?。?/td> 0K
描述： IC MCU FLASH 8KX16 W/CAN 44-TQFP
產品培訓模塊： Asynchronous Stimulus
標準包裝： 160
系列： PIC® 18F
核心處理器： PIC
芯體尺寸： 8-位
速度： 40MHz
連通性： CAN，I²C，SPI，UART/USART
外圍設備： 欠壓檢測/復位，LVD，POR，PWM，WDT
輸入/輸出數： 33
程序存儲器容量： 16KB（8K x 16）
程序存儲器類型： 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量： 768 x 8
電壓 - 電源 (Vcc/Vdd)： 4.2 V ~ 5.5 V
數據轉換器： A/D 8x10b
振蕩器型： 外部
工作溫度： -40°C ~ 125°C
封裝/外殼： 44-TQFP
包裝： 托盤
2006 Microchip Technology Inc.
DS41159E-page 61
PIC18FXX8
5.3
Reading the Data EEPROM
Memory
To read a data memory location, the user must write the
address to the EEADR register, clear the EEPGD and
CFGS control bits (EECON1<7:6>) and then set
control bit RD (EECON1<0>). The data is available in
the very next instruction cycle of the EEDATA register;
therefore, it 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).
EXAMPLE 5-1:
DATA EEPROM READ
5.4
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 writ-
ten to the EEDATA register. Then, the sequence in
Example 5-2 must be followed to initiate the write cycle.
The write will not initiate if the above 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 exe-
cution (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, clearing the
WREN bit will not affect the current write cycle. 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 Write Complete
Interrupt Flag bit (EEIF) is set. The user may either
enable this interrupt or roll this bit. EEIF must be
cleared by software.
EXAMPLE 5-2:
DATA EEPROM WRITE
MOVLW
DATA_EE_ADDR
;
MOVWF
EEADR
;Data Memory Address
;to read
BCF
EECON1, EEPGD
;Point to DATA memory
BCS
EECON1, CFGS
;
BSF
EECON1, RD
;EEPROM Read
MOVF
EEDATA, W
;W = EEDATA
MOVLW
DATA_EE_ADDR
;
MOVWF
EEADR
; Data Memory Address to read
MOVLW
DATA_EE_DATA
;
MOVWF
EEDATA
; Data Memory Value to write
BCF
EECON1, EEPGD
; Point to DATA memory
BCF
EECON1, CFGS
; Access program FLASH or Data EEPROM memory
BSF
EECON1, WREN
; Enable writes
BCF
INTCON, GIE
; Disable interrupts
Required
MOVLW
55h
;
Sequence
MOVWF
EECON2
; Write 55h
MOVLW
0AAh
;
MOVWF
EECON2
; Write AAh
BSF
EECON1, WR
; Set WR bit to begin write
BSF
INTCON, GIE
; Enable interrupts
.
; user code execution
.
BCF
EECON1, WREN
; Disable writes on write complete (EEIF set)
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相關代理商/技術參數
參數描述
PIC18F448-I/L 功能描述:8位微控制器 -MCU 16KB 768 RAM 34 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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
PIC18F448-I/L 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU CAN ADC 18F448
PIC18F448-I/P 功能描述:8位微控制器 -MCU 16KB 768 RAM 34 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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
PIC18F448-I/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU CAN ADC 18F448
PIC18F448-I/PT 功能描述:8位微控制器 -MCU 16KB 768 RAM 34 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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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