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Setting up Timer1 oscillator of PIC18F45K20

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kgng97ccs

Joined: 02 Apr 2022
Posts: 97

Setting up Timer1 oscillator of PIC18F45K20

Posted: Thu May 12, 2022 4:38 am

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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: 21708

Posted: Thu May 12, 2022 5:09 am

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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: 97


Posted: Thu May 12, 2022 8:15 pm

Thank you for your help.

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