參數(shù)資料
型號: PIC16F77
廠商: Microchip Technology Inc.
英文描述: 40-Pin 8-Bit CMOS FLASH Microcontrollers(40腳、8位CMOS 閃速微控制器)
中文描述: 40引腳8位CMOS閃存微控制器(40腳,8位的CMOS閃速微控制器)
文件頁數(shù): 42/170頁
文件大?。?/td> 3150K
代理商: PIC16F77
PIC16F7X
DS30325A-page 42
Advance Information
2000 Microchip Technology Inc.
4.3
Reading the FLASH Program Memory
A program memory location may be read by writing two
bytes of the address to the PMADR and PMADRH reg-
isters and then setting control bit RD (PMCON1<0>).
Once the read control bit is set, the microcontroller will
use the next two instruction cycles to read the data. The
data is available in the PMDATA and PMDATH regis-
ters after the second
NOP
instruction. Therefore, it can
be read as two bytes in the following instructions. The
PMDATA and PMDATH registers will hold this value
until another read operation.
EXAMPLE 4-1:
FLASH PROGRAM READ
BSF STATUS, RP1 ;
BCF STATUS, RP0 ; Bank 2
MOVF ADDRH, W ;
MOVWF PMADRH ; MSByte of Program Address to read
MOVF ADDRL, W ;
MOVWF PMADR ; LSByte of Program Address to read
BSF STATUS, RP0 ; Bank 3
Required
BSF PMCON1, RD ; EEPROM Read
Sequence
NOP ; memory is read in the next two cycles after BSF PMCON1,RD
NOP ;
BCF STATUS, RP0 ; Bank 2
MOVF PMDATA, W ; W = LSByte of Program PMDATA
MOVF PMDATH, W ; W = MSByte of Program PMDATA
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