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Timer runs to fast with a 12 MHz crystal

The crystal is a 12 Mhz
//#include "F100GlobalDataTypeDefs.h"
//#include "F100GlobalDef.h"
//#include "F100GlobalVars.h"
//#include "F100Functions.h"
//#include "F100HW.h"

void msecWait(uint milliSeconds)
{ /* Since the counter counts up it is necessarey to subtract the nuber of counts/millsecnd from the maximum count for the sixteen bit unsigned intiger (65535 - 922 = 64613 = 0xFC65) seperated into bytes (uchar) hiByte = 0xFC and lowByte = 0x65 */
// uchar highByte = 0xfc, lowByte = 0x65; //922 counts/(milisecond up count) // count is from 64613 (0xfc65)

// bit bitET0, bitTR0;

/************ Based on 12 MHz crystal**** Input in miliseconds ***************

bitTR0 = TR0; // Save TR0 //
TR0 = 0; // Stop T0 //
bitET0 = ET0; // Save ET0 //
ET0 = 0; // Disable T0 //
while (milliSeconds > NOMILLISECONDS) { TH0 = highByte; TL0 = lowByte; TR0 = 1; //start timer 0 // while (!TF0) {;} TR0 = 0 ; // stop timer 0 // TF0 = 0 ; milliSeconds--; }
ET0 = bitET0; // Restore ET0 //
TR0 = bitTR0; // Restore TR0 // */
}

Parents

0 Andy Neil over 18 years ago in reply to Harry Watkins

   SCON   = 0x70;        // Set serial communication in mode 01
                         // (8-bit) and reciever enabled (RI = 1).
   PCON   = 0x00;        //  Set SMOD0 = 0.
   T2CON &= 0xF0;        //  Set timer 2 as baud rate generator.
   RCAP2H = 0xFF;        //  Set 9600 baud high.
   RCAP2L = 0xD9;        //  Set 9600 baud high.
   SADEN  = 0xFF;        //  Enable slave address
                         //  for automatic address recognition.
   SADDR  = F100ADDRESS; //  Address of data byte (0xF3).
   RCLK   = 1;           //  Receiving baud rate clock.
   TCLK   = 1;           //  Transmission baud rate clock.
   SM2    = 1;           //  Enable automatic address recognition.
   IE     = 0x1E;        //  Enable timer 1, 0, External 1, and serial interrupts.
   EA     = 1;           //  Enable global interrupt flag.
   TR1    = 1;           //  Start timer 1.
   TR2    = 1;           //  Start timer 2.
   ET1    = 1;           //  Enable Timer 1 interrupt.
   EX1    = 1;           //  Enable External interrupt 1.
   IP     = 0x10;        //  Set Serial Interrupt as highest priority.

Isn't that better?

Reply

0 Andy Neil over 18 years ago in reply to Harry Watkins

   SCON   = 0x70;        // Set serial communication in mode 01
                         // (8-bit) and reciever enabled (RI = 1).
   PCON   = 0x00;        //  Set SMOD0 = 0.
   T2CON &= 0xF0;        //  Set timer 2 as baud rate generator.
   RCAP2H = 0xFF;        //  Set 9600 baud high.
   RCAP2L = 0xD9;        //  Set 9600 baud high.
   SADEN  = 0xFF;        //  Enable slave address
                         //  for automatic address recognition.
   SADDR  = F100ADDRESS; //  Address of data byte (0xF3).
   RCLK   = 1;           //  Receiving baud rate clock.
   TCLK   = 1;           //  Transmission baud rate clock.
   SM2    = 1;           //  Enable automatic address recognition.
   IE     = 0x1E;        //  Enable timer 1, 0, External 1, and serial interrupts.
   EA     = 1;           //  Enable global interrupt flag.
   TR1    = 1;           //  Start timer 1.
   TR2    = 1;           //  Start timer 2.
   ET1    = 1;           //  Enable Timer 1 interrupt.
   EX1    = 1;           //  Enable External interrupt 1.
   IP     = 0x10;        //  Set Serial Interrupt as highest priority.

Isn't that better?

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