     <<  Tim <timdet@SAN.RR.COM>

<<Thanks for the reply, but my question should have been. How do you use
<<the #ROM directive to insert the calibration data back into a 12C672
JW
<<and or OTP?  The ROM directive is what I thought I had to use but I
<<couldn't figure out how to
Tim,
 You can use ROM-setup, which CCS puts to rom code after compile: 
 
#ROM 0x1ff={0xcb0}  // B0 is calibration value 

or direct assembly before you need exact timing:  

void main ( void) {
  char ch,i;
  setup_counters(RTCC_INTERNAL,RTCC_DIV_2| ENABLE_PULLUPS);

 // 0x90 or  0x7F  are common values

  #asm
   MOVLW 0x90
   MOVWF   5
  #endasm

or direct byte method
#byte OSCCAL= 0x5

void main ( void) {
 OSCCAL=0x90; 
... 
}
But what to do when you have lost your calibration value?
You can easily find it!
Make a loop, which sends osccal variable to RS232 e.g. 9600 baud and
look when baud and osccal are the 
same! 
If anybody wants it send a mail.
Pekka 

-- 
Û¼¡`¡¼Û¿,üü,¿Û¼¡`¡¼Û¿,üü,¿
Pekka Ritamaki, Probyte Oy Microprocessor software & hardware design
Nirvankatu 31, 33820 TAMPERE, FINLAND http://www.sci.fi/~pri
tel: Int. 358-3-2661885 fax: Int. +358-3-2661886 email:pri@sci.fi