參數(shù)資料
型號(hào)： R5F3651NNFC
元件分類： 微控制器/微處理器
英文描述： MICROCONTROLLER, PQFP128
封裝： 20 X 14 MM, 0.50 MM PITCH, LQFP-128
文件頁(yè)數(shù)： 69/81頁(yè)
文件大小： 879K
代理商： R5F3651NNFC
87
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
14. 8-bit Timer/Counter0 with PWM
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. The main features are:
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)
14.1
Overview
A simplified block diagram of the 8-bit Timer/Counter is shown in Figure 14-1. For the actual
placement of I/O pins, refer to “Pin Descriptions” on page 9. CPU accessible I/O Registers,
including I/O bits and I/O pins, are shown in bold. The device-specific I/O Register and bit loca-
The PRTIM0 bit in “Power Reduction Register” on page 43 must be written to zero to enable
Timer/Counter0 module.
Figure 14-1. 8-bit Timer/Counter Block Diagram
14.1.1
Definitions
Many register and bit references in this section are written in general form. A lower case “n”
replaces the Timer/Counter number, in this case 0. A lower case “x” replaces the Output Com-
pare Unit, in this case Compare Unit A or Compare Unit B. However, when using the register or
bit defines in a program, the precise form must be used, i.e., TCNT0 for accessing
Timer/Counter0 counter value and so on.
Timer/Counter
D
ATA
B
U
S
=
TCNTn
Waveform
Generation
OCnA
Control Logic
count
clear
direction
TOVn
(Int.Req.)
OCRnx
TCCRnA
Clock Select
Tn
Edge
Detector
( From Prescaler )
clkTn
OCnA
(Int.Req.)
=
OCRnx
Waveform
Generation
OCnB
(Int.Req.)
TCCRnB
=
Fixed
TOP
Values
= 0
TOP
BOTTOM
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