PIC16F15213 datasheet(165/439 Pages) MICROCHIP

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Table 20-1. Timer1 Enable Selections

Timer1 Operation

Count enabled

Always on

Off

20.2

Clock Source Selection

The CS bits select the clock source for Timer1. These bits allow the selection of several possible synchronous and

asynchronous clock sources.

20.2.1

Internal Clock Source

When the internal clock source is selected, the TMRx register will increment on multiples of FOSC as determined by

the Timer1 prescaler.

When the FOSC internal clock source is selected, the TMRx register value will increment by four counts every

instruction clock cycle. Due to this condition, a two LSB error in resolution will occur when reading the TMRx value.

To utilize the full resolution of Timer1, an asynchronous input signal must be used to gate the Timer1 clock input.

Important: In Counter mode, a falling edge must be registered by the counter prior to the first

incrementing rising edge after any one or more of the following conditions:

• Timer1 enabled after POR

• Write to TMRxH or TMRxL

• Timer1 is disabled

• Timer1 is disabled (ON = 0) when TxCKI is high, then Timer1 is enabled (ON = 1) when TxCKI is low.

Refer to the figure below.

Figure 20-2. Timer1 Incrementing Edge

TxCKI = 1

When TMRx

Enabled

TxCKI = 0

When TMRx

Enabled

Notes:

Arrows indicate counter increments.

In Counter mode, a falling edge must be registered by the counter prior to the first incrementing rising edge of

the clock.

20.2.2

External Clock Source

When the external clock source is selected, the TMRx module may work as a timer or a counter. When enabled to

count, Timer1 is incremented on the rising edge of the external clock input of the TxCKIPPS pin. This external clock

source can be synchronized to the system clock or it can run asynchronously.

PIC16F15213/14/23/24/43/44

TMR1 - Timer1 Module with Gate Control

and its subsidiaries

Data Sheet

DS40002195E-page 165

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