Hi all,

I try to use TMR1 section and read PIC16C6X documentation from Microchip.
There is some item which are not very clear:
  ** about TMR1 external oscillator:
        - does the oscillator run if T1OSCEN=1 only ?
          I mean even if TMR1CS=0 OR TMR1ON=0 ?
        - what is exactly the condition which allows the TMR1 oscillator
to run ?

  ** about TMR1 external oscillator output:
        - documentation is not very clear about Input and Output for
external oscillator / TMR1 counter input
        - in PDF doc file (30234B.PDF) 16C6X, page 51 and 52 there is the
following pin assignation for timer 1:

 for 16C64A, R64, 65, 65A:
  RC.0    T1CKIn   or T1OSCout
  RC.1                T1OSCIn

 for 16C64:
  RC.0    T1CKIn   or T1OSCIn
  RC.1                T1OSCOut

I have some difficulty to believe the PIN RC.0 and RC.1 are inverted between
the 16C64 version and the over version. It is a mistake ?

        - About TMR1 oscillator output:
If the external oscillator bit is set (T1OSCEn), does the pin T1OSCOut output
a square wave if RC.0(RC.1) port is set as output.
Who have the priority on portC, the TMR1 oscillator or the TRISC register ?
If RC.0 is set as input, can we read the pin state, i.e. the square wave from
a read port instruction ?

        - About TMR1 Counter mode:
If RC.0 is set as output, by setting and clearing this bit from a program, we
can normally incremented TMR1 counter, I'm right ?

The main problem is the documentation never said clearly when the PORT C pin
are dedictated to TIMER and when PORT C pin are dedicated to TRIS C register.
The schematic figure 5-6 at page 52 will not help the user, nothing is said
about "peripheral select" !!!!!

Thanks to help me
        Philippe. (P.TECHER@insat.com)