Elan eSL Series, User Manual

Page: 86 / 173

Chapter 3
74
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Peripheral Control eSL/eSLS Series (+ eSLZ000) User’s Manual
3.3.2 Timer 2/3
3.3.2.1 Multifunction Timer
Timer 2 and Timer3 are 8-bit multifunction timers operating in Capture and
Compare modes. Each timer is independent from each other with unique
counting rates and operation modes. These
two 8-bit timers can be combined
to form a multifunction 16-bit timer used for counting events, counting time,
measuring frequency (capture function), and generating analog-like outputs
(PWM).
Timer2 & Timer3 Attributes and Resources:
Item Timer 2 Timer 3
Clock source F
PLL
, TEXI2, F
32k
F
PLL
, TEXI3, TVIF2
Usage register TCNT2, TCCR2, TCON2 TCNT3, TCCR3, TCON3
Interrupt sources TIF2, TVIF2 TIF3, TVIF3
I/O function pin TEXI2, TCCP2 TEXI3, TCCP3
Operation mode
Capture, Compare
Wakeup
Capture, Compare
Wakeup
3.3.2.2 Features
Selection of internal and external clock sources (Timer 2/3)
Two interrupt sources : 1) Counter overflow
2) Compare is matched or timer capture occurs
Capture mode: Record Timer at a specified event (Rising, falling, or at both
edges)
Compare mode : Interval operation or change I/O periodically
Generate simple PWM waveform
:
Drive electronic machines by switching a
power amplifier on and off (Timer 2/3)
16-bit timer available (Timer 2/3 combination, MSB Timer3, LSB Timer2)