11 8-Bit Timer/Counter0 With Pwm; Features; Overview - Atmel ATtiny13A Manual

11. 8-bit Timer/Counter0 with PWM
11.1

Features

11.2

Overview

8126F–AVR–05/12
•
Two Independent Output Compare Units
•
Double Buffered Output Compare Registers
•
Clear Timer on Compare Match (Auto Reload)
•
Glitch Free, Phase Correct Pulse Width Modulator (PWM)
•
Variable PWM Period
•
Frequency Generator
•
Three Independent Interrupt Sources (TOV0, OCF0A, and OCF0B)
Timer/Counter0 is a general purpose 8-bit Timer/Counter module, with two independent Output
Compare Units, and with PWM support. It allows accurate program execution timing (event man-
agement) and wave generation.
A simplified block diagram of the 8-bit Timer/Counter is shown in
the actual placement of I/O pins, refer to
Registers, including I/O bits and I/O pins, are shown in bold. The device-specific I/O Register
and bit locations are listed in the
Figure 11-1. 8-bit Timer/Counter Block Diagram
Timer/Counter
TCNTn
=
OCRnA
=
OCRnB
TCCRnA
"Pinout of ATtiny13A" on page
"Register Description" on page
Count
Clear
Control Logic
Direction clk
Tn
TOP BOTTOM
= =
Fixed
TOP
Value
TCCRnB
ATtiny13A
Figure 11-1 on page
2. CPU accessible I/O
70.
TOVn
(Int.Req.)
Clock Select
Edge
Detector
( From Prescaler )
0
OCnA
(Int.Req.)
Waveform
Generation
OCnB
(Int.Req.)
Waveform
Generation
59. For
Tn
OCnA
OCnB
59