HSEROUT at Quarter Rate!

Hi All,

Currently using a PIC18LF26K80, and have found the HSEROUT command to outputing data at quarter of the specified rate.

Here is the header to my code:

Code:

---

#config
    CONFIG RETEN = OFF             
    CONFIG INTOSCSEL = LOW
    CONFIG SOSCSEL = LOW
    CONFIG XINST = OFF
    CONFIG FOSC = INTIO1
    CONFIG PLLCFG = ON
    CONFIG FCMEN = OFF
    CONFIG IESO = OFF
    CONFIG PWRTEN = OFF
    CONFIG BOREN = OFF
    CONFIG BORV = 0
    CONFIG BORPWR = LOW
    CONFIG WDTEN = OFF
    CONFIG WDTPS = 1
    CONFIG CANMX = PORTC
    CONFIG MSSPMSK = MSK7
    CONFIG MCLRE = OFF
    CONFIG STVREN = OFF
    CONFIG BBSIZ = BB1K
    CONFIG CP0 = OFF
    CONFIG CP1 = OFF
    CONFIG CP2 = OFF
    CONFIG CP3 = OFF
    CONFIG CPB = OFF
    CONFIG CPD = OFF
    CONFIG WRT0 = OFF
    CONFIG WRT1 = OFF
    CONFIG WRT2 = OFF
    CONFIG WRT3 = OFF
    CONFIG WRTC = OFF
    CONFIG WRTB = OFF
    CONFIG EBTR0 = OFF
    CONFIG EBTR1 = OFF
    CONFIG EBTR2 = OFF
    CONFIG EBTR3 = OFF
    CONFIG EBTRB = OFF
#endconfig
'*****
'* Defines and Device Configurations
'*****
define OSC 8                        ' Internal OSC runs at 8MHz
define HSER_RCSTA1 90h              ' Enable USART1 Receiver
define HSER_TXSTA1 20h              ' Enable USART1 Transmitter
define HSER_RCSTA2 90h              ' Enable USART2 Receiver
define HSER_TXSTA2 24h              ' Enable USART2 Transmitter
define HSER_BAUD1 9600
define HSER_BAUD2 9600
TRISA=%00000001                    ' Make PORTA.0 an input
ADCON0=%00000001                    ' Turn on ADC AN0
ADCON1=%00000000                    ' Turn off PORTB ADC's
ADCON2=%00000000                    ' Turn off PORTC ADC's
INTCON=%11000000                    ' Enable Interrupts
PIE1=%00100000                      ' Enable USART1 Interrupt
OSCCON=%01100000
REFOCON=%10100111
OSCTUNE=%10000000

---

By connecting at 2400 baud, the comms works fine, but I am hoping to find the real reason behind my errors...

Cheers :)
Mark

what crystal are you driving the PIC with? I notice you have the PLL enabled which will multiply the crystal freq. by 4 times. You have declared the operating frequency as 8 Mhz. If you have set the internal frequency as 8 Mhz then you are generating 24 Mhz. I would check your settings....

Thanks Dave,

I am currenty using the internal osc, as set by CONFIG FOSC = INTIO1 and it should be running at 8MHz by the OSCCON=%01100000 configs. In regards to the PLL, by switching it on - by either the PLLCFG or OSCTUNE, it enables the HSEROUT command to operate at the correct baud, but this results in the rest of the pic running at 4 times...

Gitchie, That is because you have declared to PBP that you are running the code @ 8 Mhz. by the statement:
define OSC 8 ' Internal OSC runs at 8MHz

This statement tells PBP to scale all timing statements like PAUSE and the like to use an 8 Mhz. oscillator. You should be setting the DEFINE statement to 32 Mhz. which is the frequency that the processor is actually being clocked at.

That's correct, but then the hserout runs at quarter speed... For the moment, I've set the baud to 9600 and will run it at 2400...

Don't you understand? Just set the baudrate to the desired rate and set the DEFINE OSC 32. Everything will work correctly.....

Thanks for your replays Dave,

But it was a typographical error with the HSER2 defines... I had HSER_BAUD2 1200 when it should have been HSER2_BAUD 1200

I was hunting for an OSC problem also

Cheers and thanks again for your suggestions