Issues to be aware of when using PIC microcontroller TIMER1-EEWORLD

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1. When TMR1H and TMR1L are initialized, the prescaler will be automatically cleared.

2. When the register is written to TMR1H and TMR1L, the prescaler will be cleared. When TMR1 is in operation, writing to TMR1H or TMR1L value may write undesired values.

3. When TMR1 works in asynchronous counting mode, it cannot be used as the reference time for input capture or output capture of the CCP module.

4. During power-on reset (POR) or other reset, TMR1H and TMR1L retain their original values and will not be reset to 0000H.

5. At power-on reset or power-off reset, the value of the control register T1CON will return to 00H, TMR1 will be turned off, and the prescaler ratio will be set to 1:1. The value of T1CON will not be affected during other resets.

6. If you want to return the contents of TMR1H and TMR1L to 00H during reset, you can use a program to do this, that is, turn off TMR1 first, and then clear TMR1H and TMR1L respectively.

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