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Setting up Timer1 oscillator of PIC18F45K20

 
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kgng97ccs



Joined: 02 Apr 2022
Posts: 46

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Setting up Timer1 oscillator of PIC18F45K20
PostPosted: Thu May 12, 2022 4:38 am     Reply with quote

This relates to setting up the Timer1 oscillator of PIC18F45K20.

The 18F45K20.h file has the following options for Timer1:
Code:
#define T1_DISABLED         0
#define T1_INTERNAL         0x85
#define T1_EXTERNAL         0x87
#define T1_EXTERNAL_SYNC    0x83

#define T1_CLK_OUT          8

#define T1_DIV_BY_1         0
#define T1_DIV_BY_2         0x10
#define T1_DIV_BY_4         0x20
#define T1_DIV_BY_8         0x30

There is no #define constant to set the T1OSCEN bit (bit 3) of T1CON.

It seems that the constant should be 0b00001000, but this number (8) is assigned to T1_CLK_OUT.

Is it that one has to specifically define the constant or access the register in order to set this bit?
PCM programmer



Joined: 06 Sep 2003
Posts: 21644

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PostPosted: Thu May 12, 2022 5:09 am     Reply with quote

This is how you enable the external oscillator circuit for Timer1;
Code:
setup_timer_1(T1_EXTERNAL | T1_DIV_BY_1 | T1_CLK_OUT);


T1_CLK_OUT enables the driver for the T1OSO pin (Timer1 osc out).
So in a way, it is enabling "clock out".
kgng97ccs



Joined: 02 Apr 2022
Posts: 46

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PostPosted: Thu May 12, 2022 8:15 pm     Reply with quote

Thank you for your help.
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