PA3040
Advanced Member level 3
Dear All,
Today experiment with UART + MCU 16f877a
1. I wrote a program and compiled successfully
2. Simulated in Proteus with virtual terminal
3. displayed unexpected character
Please find the attachment for picturs
Advice is needed
Thanks in advance
![uart.jpg uart.jpg](https://www.edaboard.com/data/attachments/26/26333-8ee205bd561d676321acca9678031a7c.jpg)
Today experiment with UART + MCU 16f877a
1. I wrote a program and compiled successfully
2. Simulated in Proteus with virtual terminal
3. displayed unexpected character
Please find the attachment for picturs
Advice is needed
Thanks in advance
Code:
char_loader equ 0x20 ;bank 0
LIST P=P16F877
#include <p16f877a.inc>
__config 3f39
org 0x000
start goto main
main call sys_init
loop call load_char
goto loop
load_char movlw 'T'
movwf char_loader
call send_char
movlw 'E'
movwf char_loader
call send_char
movlw 'S'
movwf char_loader
call send_char
movlw 'T'
movwf char_loader
call send_char
movlw '1'
movwf char_loader
call send_char
movlw '2'
movwf char_loader
call send_char
movlw '3'
movwf char_loader
call send_char
return
send_char btfss PIR1,TXIF ;Check the USART transmit buffer is empty
goto $-1
movf char_loader,w
movwf TXREG
return
sys_init bsf STATUS,5
movlw b'00000000'
movwf TRISC
movlw 0x11
movwf SPBRG ; Set Baud rate 9600bps
movlw b'10100000' ; 8-bit transmit, transmitter enabled,
movwf TXSTA ; asynchronous mode, low speed mode
bcf STATUS,5
bsf RCSTA,SPEN ;Serial port enabled
;(configures RC7/RX/DT and
;RC6/TX/CK pins as serial port pins)
return
end
![uart.jpg uart.jpg](https://www.edaboard.com/data/attachments/26/26333-8ee205bd561d676321acca9678031a7c.jpg)