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PIC16F877T-20PQ 参数 Datasheet PDF下载

PIC16F877T-20PQ图片预览
型号: PIC16F877T-20PQ
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器\n [8-Bit Microcontroller ]
分类和应用: 微控制器
文件页数/大小: 200 页 / 3338 K
品牌: ETC [ ETC ]
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PIC16F87X  
data is available in the EEDATA and EEDATH registers  
after the second NOP instruction. Therefore, it can be  
read as two bytes in the following instructions. The  
EEDATA and EEDATH registers will hold this value until  
another read operation or until it is written to by the user  
(during a write operation).  
4.5  
Reading the FLASH Program Memory  
A program memory location may be read by writing two  
bytes of the address to the EEADR and EEADRH reg-  
isters, setting the EEPGD control bit (EECON1<7>)  
and then setting control bit RD (EECON1<0>). Once  
the read control bit is set, the microcontroller will use  
the next two instruction cycles to read the data. The  
EXAMPLE 4-3: FLASH PROGRAM READ  
BSF  
STATUS, RP1  
STATUS, RP0  
ADDRH  
;
BCF  
; Bank 2  
;
MOVLW  
MOVWF  
MOVLW  
MOVWF  
BSF  
EEADRH  
; MSByte of Program Address to read  
ADDRL  
;
EEADR  
; LSByte of Program Address to read  
; Bank 3  
STATUS, RP0  
EECON1, EEPGD  
EECON1, RD  
BSF  
; Point to PROGRAM memory  
; EEPROM Read  
Required  
Sequence  
BSF  
NOP  
NOP  
; memory is read in the next two cycles after BSF EECON1,RD  
;
BCF  
STATUS, RP0  
; Bank 2  
MOVF  
MOVF  
EEDATA, W  
EEDATH, W  
; W = LSByte of Program EEDATA  
; W = MSByte of Program EEDATA  
DS30292B-page 44  
1999 Microchip Technology Inc.  
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