Can't set 38400 baud @ 48Mhz

[Andre_Pretorius]

Hi there
Can someone please help i am trying to upgrage one of my projects to a 18F4550 but it is turning into a nigtmare, for some reason i can not get my serial port to work
Any help would be appreciated

ps I have downloaded the patch for 2.46 but it seems not to help

my 18F4550.inc file

  NOLIST
    ifdef PM_USED
        LIST
        "Error: PM does not support this device.  Use MPASM."
        NOLIST
    else
        LIST
        LIST p = 18F4550, r = dec, w = -311, w = -230, f = inhx32
        INCLUDE "P18F4550.INC"	; MPASM  Header
        __CONFIG    _CONFIG1L, _PLLDIV_5_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L  
	__CONFIG    _CONFIG1H, _FOSC_HSPLL_HS_1H & _FCMEN_OFF_1H & _IESO_OFF_1H 
	__CONFIG    _CONFIG2L, _PWRT_ON_2L & _BOR_ON_2L  & _BORV_2_2L  & _VREGEN_ON_2L   
	__CONFIG    _CONFIG2H, _WDT_OFF_2H 
	__CONFIG    _CONFIG3H, _MCLRE_ON_3H & _LPT1OSC_OFF_3H & _PBADEN_OFF_3H & _CCP2MX_ON_3H 
	__CONFIG    _CONFIG4L, _STVREN_ON_4L & _LVP_OFF_4L & _ICPRT_OFF_4L  & _XINST_OFF_4L & _DEBUG_OFF_4L 
       
        
        NOLIST
    endif
        LIST
EEPROM_START	EQU	0F00000h
BLOCK_SIZE	EQU	32

And my setup i am running a 48M cristal

'*Serial port Setup 3800 8N1*
BAUDCON.3 = 1 'SETUP FOR HIGH SPEED.
DEFINE HSER_RCSTA 90H
DEFINE HSER_TXSTA 24H 'HIGH SPEED MODE BAUD RATE GENERATOR
DEFINE HSER_BAUD 38400
DEFINE HSER_SPBRG 77 ' 38400 Bauds
DEFINE HSER_CLROERR 1

[Darrel Taylor]

And my setup i am running a 48M cristal

Ummm, you mean you are running a 20mhz crystal, with DEFINE OSC 48?

I Hope.

[Andre_Pretorius]

No, 48M cristal with define osc 48

[Darrel Taylor]

The highest crystal frequency you can use on an 18F4550 is 25Mhz (24 if using the PLL).

If it's a TTL Oscillator, then it's possible to put 48Mhz directly into the PIC with EC mode. But XT or HS modes cannot drive a 48Mhz crystal.

The configs you showed are set up for a 20Mhz crystal.

[b1arrk5]

Also, SPBRG 77 is the value if SPBRGH = 0, since you have SPBRGH set to 1, then SPBRG should be 56.

Jerry