CipiCips
- 8th August 2016, 13:31
Hello,
I have small project using PIC18F26K22 with 8MHz crystal external oscillator. USART output from PIC is connected over TTL to USB and I use TERMITE serial software to read data from PIC.
I wanna send numbers from 1-255 over USART with a pause of 1 sec.
From pbp manual it state that for every other external oscillator I need to use DEFINE OSC, for my example DEFINE OSC 8.
DEFINE OSC 8
define HSER_BAUD 9600
DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
DEFINE HSER_TXSTA 20h ' Enable transmit, BRGH = 0
DEFINE HSER_CLROERR 1 ' Clear overflow automatically
define HSER2_BAUD 9600
DEFINE HSER2_RCSTA 90h ' Enable serial port & continuous receive
DEFINE HSER2_TXSTA 20h ' Enable transmit, BRGH = 0
DEFINE HSER2_CLROERR 1 ' Clear overflow automatically
ANSELC = 0
i var word
i = 0
tajmer var byte
start:
i = i+ 1
Hserout2 [dec i,13,10]
pause 1000
goto start
Since pause is in millisecond this should give me 1 sec delay. But this delay last to to long over my serial terminal.
I have tried many things and find it only working if I add this line:
#config
CONFIG FOSC = HSHP
#endconfig
When using this confing pause 1000 is really 1 sec. I think with this command I have disabled internal oscillator.
When I look deeper in datasheet it is said that HSHP is best for high power oscillator >16MHz and for oscillators used from 4MHz - 16MHz should be used HSMP.
When I used
#config
CONFIG FOSC = HSMP
#endconfig
again my pause 1000 is not 1 sec.
Any help, advice, correction ?
Thx
I have small project using PIC18F26K22 with 8MHz crystal external oscillator. USART output from PIC is connected over TTL to USB and I use TERMITE serial software to read data from PIC.
I wanna send numbers from 1-255 over USART with a pause of 1 sec.
From pbp manual it state that for every other external oscillator I need to use DEFINE OSC, for my example DEFINE OSC 8.
DEFINE OSC 8
define HSER_BAUD 9600
DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
DEFINE HSER_TXSTA 20h ' Enable transmit, BRGH = 0
DEFINE HSER_CLROERR 1 ' Clear overflow automatically
define HSER2_BAUD 9600
DEFINE HSER2_RCSTA 90h ' Enable serial port & continuous receive
DEFINE HSER2_TXSTA 20h ' Enable transmit, BRGH = 0
DEFINE HSER2_CLROERR 1 ' Clear overflow automatically
ANSELC = 0
i var word
i = 0
tajmer var byte
start:
i = i+ 1
Hserout2 [dec i,13,10]
pause 1000
goto start
Since pause is in millisecond this should give me 1 sec delay. But this delay last to to long over my serial terminal.
I have tried many things and find it only working if I add this line:
#config
CONFIG FOSC = HSHP
#endconfig
When using this confing pause 1000 is really 1 sec. I think with this command I have disabled internal oscillator.
When I look deeper in datasheet it is said that HSHP is best for high power oscillator >16MHz and for oscillators used from 4MHz - 16MHz should be used HSMP.
When I used
#config
CONFIG FOSC = HSMP
#endconfig
again my pause 1000 is not 1 sec.
Any help, advice, correction ?
Thx