ht82a836r Holtek Semiconductor Inc., ht82a836r Datasheet - Page 19

• Manufacturer Part Number: ht82a836r
• Description: Usb Audio Mcu
• Manufacturer: Holtek Semiconductor Inc.

Configuring the Timer/Event Counter Input Clock
Source
The Timer/Event Counter s clock can originate from var-
ious sources. The system clock source is used when the
Timer/Event Counter is in the timer mode or in the pulse
width measurement mode. An external clock source is
used when the Timer/Event Counter is in the event
counting mode, the clock source being provided on the
external timer pin, TMR0 or TMR1. Depending upon the
condition of the T0E or T1E bit, each high to low, or low
to high transition on the external timer pin will increment
the counter by one.
Rev. 1.00
Timer/Event Counter 0 Structure
Timer/Event Counter 1 Structure
19
Timer Registers - TMR0H/TMR0L, TMR1L/TMR1H
The timer register are special function registers located
in the Special Purpose Data Memory and is the place
where the actual timer values are stored. These regis-
ters exist in pairs and are known as TMR0L/TMR0H and
TMR1L/TMR1H. The value in these timer registers in-
creases by one each time an internal clock pulse is re-
ceived or an external transition occurs on the external
timer pin. The timer will count from the initial value
loaded by the preload register to the full count of FFFFH
at which point the timer overflows and an internal inter-
rupt signal is generated. The timer value will then be re-
HT82A836R
March 20, 2008