ATMEGA8-16AU Atmel, ATMEGA8-16AU Datasheet - Page 76
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ATMEGA8-16AU
Manufacturer Part Number
ATMEGA8-16AU
Description
IC AVR MCU 8K 16MHZ 5V 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8-16AU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP, 32-VQFP
For Use With
ATSTK600-TQFP32 - STK600 SOCKET/ADAPTER 32-TQFPATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1005 - ISP 4PORT FOR ATMEL AVR MCU JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRISP2 - PROGRAMMER AVR IN SYSTEMATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Registers
76
ATmega8(L)
Figure 32. 16-bit Timer/Counter Block Diagram
Note:
The Timer/Counter (TCNT1), Output Compare Registers (OCR1A/B), and Input Capture Regis-
ter (ICR1) are all 16-bit registers. Special procedures must be followed when accessing the 16-
bit registers. These procedures are described in the section
page
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 regis-
ters 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
The double buffered Output Compare Registers (OCR1A/B) are compared with the Timer/Coun-
ter 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).
put Compare Units” on page 83.
Flag (OCF1A/B) which can be used to generate an Output Compare interrupt request.
77. The Timer/Counter Control Registers (TCCR1A/B) are 8-bit registers and have no CPU
1. Refer to
Timer/Counter1 pin placement and description
“Pin Configurations” on page
Timer/Counter
TCCRnA
OCRnB
OCRnA
TCNTn
ICRn
=
=
Direction
The Compare Match event will also set the Compare Match
Count
Clear
Control Logic
TOP
=
TCCRnB
2,
(1)
Values
BOTTOM
Fixed
TOP
Table 22 on page
ICFn (Int.Req.)
Detector
clk
Edge
=
Tn
0
“Accessing 16-bit Registers” on
58, and
OCFnA
(Int. Req.)
OCFnB
(Int.Req.)
TOVn
(Int. Req.)
Clock Select
Generation
Generation
( From Prescaler )
Waveform
Waveform
Canceler
Detector
Noise
Edge
Table 28 on page 63
Comparator Ouput )
( From Analog
2486Z–AVR–02/11
OCnA
OCnB
ICPn
T
Tn
1
See “Out-
).
for