PDF TB025 Data sheet ( Hoja de datos )

Número de pieza	TB025
Descripción	Microcontrollers
Fabricantes	Microchip Technology
Logotipo
Hay una vista previa y un enlace de descarga de TB025 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas
No Preview Available ! M TB025 Downloading HEX Files to PIC16F87X PICmicro® Microcontrollers Author: Rodger Richey Microchip Technology Inc. INTRODUCTION www.DataSheet4U.com The release of the PIC16F87X devices introduces the ﬁrst mid-range family of devices from Microchip Tech- nology that has the capability to read and write to inter- nal program memory. This family has FLASH-based program memory, SRAM data memory and EEPROM data memory. The FLASH program memory allows for a truly reprogrammable system. Table 1 shows the fea- tures of the PIC16F87X family of devices. TABLE 1 PIC16F87X FAMILY FEATURES ACCESSING MEMORY The read and write operations are controlled by a set of Special Function Registers (SFRs). There are six SFRs required to access the FLASH program memory: • EECON1 • EECON2 • EEDATA • EEDATH • EEADR • EEADRH The registers EEADRH:EEADR holds the 12-bit address required to access a location in the 8K words of pro- gram memory. The registers EEDATH:EEDATA are used to hold the data values. When reading program mem- ory, the EEPGD bit (EECON1<7>) must be set to indicate to the microcontroller that the operation is going to be on program memory. If the bit is cleared, the operation will be performed on data memory at the address pointed to by EEADR. The EEDATA register will hold the data. The EECON1 register also has bits for write enable and to initiate the read or write operation. There is also a bit to indicate a write error has occurred, possibly due to a reset condition happening while a write operation is in progress. Figure 1 shows the register map for EECON1. The EECON2 register is not a physical register. Reading it will result in all '0's. This register is used exclusively in the EEPROM and FLASH write sequences. Listing 1 shows the code snippet to initiate a write operation on the PIC16F87X devices. Key Features Operating Frequency Resets Flash Prog Memory (14-bit words) Data Memory (bytes) EEPROM Data Memory Interrupts I/O Ports Timers Capture/Compare/PWM modules Serial Communications Parallel Communications 10-bit Analog-to-Digital Module PIC16F873 DC - 20 MHz POR, BOR 4K 192 128 13 Ports A,B,C 3 2 MSSP, USART — 5 input channels PIC16F874 DC - 20 MHz POR, BOR 4K 192 128 14 Ports A,B,C,D,E 3 2 MSSP, USART PSP 8 input channels PIC16F876 DC - 20 MHz POR, BOR 8K 368 256 13 Ports A,B,C 3 2 MSSP, USART — 5 input channels PIC16F877 DC - 20 MHz POR, BOR 8K 368 256 14 Ports A,B,C,D,E 3 2 MSSP, USART PSP 8 input channels © 1998 Microchip Technology Inc. DS91025A-page 1 1 page TB025 nop bcf www.DataSheet4U.com banksel bsf bsf bcf nop movf subwf btfss retlw movf subwf btfss retlw incf btfsc incf decf goto DRCkChecksum call addwf btfss retlw goto EndOfFileRec decf btfss goto call addwf btfss retlw retlw EECON1,WREN EECON1 EECON1,EEPGD EECON1,RD STATUS,RP0 EEDATH,W HexDataH,W STATUS,Z 0xff EEDATA,W HexDataL,W STATUS,Z 0xff AddrL,F STATUS,Z AddrH,F ByteCount,F DRLoop GetHex8 LineChecksum,W STATUS,Z 1 DCStart RecType,W STATUS,Z DCStart GetHex8 LineChecksum,W STATUS,Z 1 0 ;Disable writes ;Read sequence ;Set EEPGD to indicate program memory ;Enable reads from memory ;Compare memory value to HexDataH:HexDataL ;If upper byte not equal, return FFh ; to indicate programming failure ;If lower byte not equal, return FFh ; to indicate programming failure ;Increment address for next iteration ;Decrement byte count ;Go back to check for ByteCount = 0 ;Checksum verification ;Read in checksum ;Add to calculated checksum ;Result should be 0 ; If not return 1 to indicate checksum fail ;Do it again ;End of File record (01h) ;If EOF record, decrement should = 0 ;Not valid record type, wait for next : ;Read in checksum ;Add to calculated checksum ;Result should be 0 ; If not return 1 to indicate checksum fail ;Otherwise return 0 to indicate success GetByte ; Insert your code here to retrieve a byte of data from ; the desired interface. In this case it is the USART on F877. ;clear CTS ; banksel PIR1 ;GH4Waitbtfss PIR1,RCIF ; goto GH4Wait ;set CTS nop banksel RCREG movf RCREG,W return GetHex8 call call movwf swapf GetByte ASCII2Hex Temp Temp,F ;This function uses the USART ;Read a character from the USART ;Convert the character to binary ;Store result in high nibble call call iorwf movf return GetByte ASCII2Hex Temp,F Temp,W ;Read a character from the USART ;Convert the character to binary ;Store result in low nibble ;Move result into WREG © 1998 Microchip Technology Inc. DS91025A-page 5 5 Page

Páginas	Total 8 Páginas
PDF Descargar	[ Datasheet TB025.PDF ]

Hoja de datos destacado

Número de pieza	Descripción	Fabricantes
TB0213A	IF SAW Filter Low Loss 70MHz	Golledge
TB0213A	(TB0xxxA) SAW Filters	GSIF
TB0213A	Low Loss 70MHz IF SAW Filter	TAI-SAW Technology
TB025	Microcontrollers	Microchip Technology

Número de pieza	Descripción	Fabricantes
SLA6805M	High Voltage 3 phase Motor Driver IC.	Sanken
SDC1742	12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.	Analog Devices

DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.

DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar