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ATMEGA8515 Datasheet(PDF) 98 Page - ATMEL Corporation

Part # ATMEGA8515
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  257 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA8515 Datasheet(HTML) 98 Page - ATMEL Corporation

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98
ATmega8515(L)
2512K–AVR–01/10
Figure 47. 16-bit Timer/Counter Block Diagram
(1)
Note:
1. Refer to Figure 1 on page 2, Table 29 on page 67, and Table 35 on page 72 for
Timer/Counter1 pin placement and description.
Registers
The Timer/Counter (TCNT1), Output Compare Registers (OCR1A/B), and Input Capture
Register (ICR1) are all 16-bit registers. Special procedures must be followed when
accessing the 16-bit registers. These procedures are described in the section “Access-
ing 16-bit Registers” on page 100. The Timer/Counter Control Registers (TCCR1A/B)
are 8-bit registers and have no CPU access restrictions. Interrupt requests (abbreviated
to Int.Req. in the figure) signals are all visible in the Timer Interrupt Flag Register (TIFR).
All interrupts are individually masked with the Timer Interrupt Mask Register (TIMSK).
TIFR and TIMSK are not shown in the figure since these registers are shared by other
timer units.
The Timer/Counter can be clocked internally, via the prescaler, or by an external clock
source on the T1 pin. The Clock Select logic block controls which clock source and edge
the Timer/Counter uses to increment (or decrement) its value. The Timer/Counter is
inactive when no clock source is selected. The output from the clock select logic is
referred to as the timer clock (clk
T1).
The double buffered Output Compare Registers (OCR1A/B) are compared with the
Timer/Counter value at all time. The result of the compare can be used by the waveform
generator to generate a PWM or variable frequency output on the Output Compare Pin
(OC1A/B). See “Output Compare Units” on page 106. The Compare Match event will
Clock Select
Timer/Counter
OCRnA
OCRnB
ICRn
=
=
TCNTn
Waveform
Generation
Waveform
Generation
OCnA
OCnB
Noise
Canceler
ICPn
=
Fixed
TOP
Values
Edge
Detector
Control Logic
= 0
TOP
BOTTOM
Count
Clear
Direction
TOVn
(Int.Req.)
OCnA
(Int.Req.)
OCnB
(Int.Req.)
ICFn (Int.Req.)
TCCRnA
TCCRnB
( From Analog
Comparator Ouput )
Tn
Edge
Detector
( From Prescaler )
clk
Tn


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