ATMEGA8L-8PU Atmel, ATMEGA8L-8PU Datasheet - Page 67
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ATMEGA8L-8PU
Manufacturer Part Number
ATMEGA8L-8PU
Description
IC AVR MCU 8K 8MHZ 3V 28DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets
1.ATMEGA8L-8MU.pdf
(25 pages)
2.ATMEGA8L-8MU.pdf
(302 pages)
3.ATMEGA8-16PU.pdf
(305 pages)
Specifications of ATMEGA8L-8PU
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
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)
2.7 V ~ 5.5 V
Data Converters
A/D 6x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-DIP (0.300", 7.62mm)
Cpu Family
ATmega
Device Core
AVR
Device Core Size
8b
Frequency (max)
8MHz
Interface Type
SPI/TWI/USART
Total Internal Ram Size
1KB
# I/os (max)
23
Number Of Timers - General Purpose
3
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
6-chx10-bit
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Through Hole
Pin Count
28
Package Type
PDIP
Processor Series
ATMEGA8x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
1 KB
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
23
Number Of Timers
3
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
3rd Party Development Tools
EWAVR, EWAVR-BL
Minimum Operating Temperature
- 40 C
Controller Family/series
AVR MEGA
No. Of I/o's
23
Eeprom Memory Size
512Byte
Ram Memory Size
1KB
Cpu Speed
8MHz
Rohs Compliant
Yes
For Use With
ATSTK600-TQFP32 - STK600 SOCKET/ADAPTER 32-TQFPATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRISP2 - PROGRAMMER AVR IN SYSTEMATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
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Manufacturer:
BROADCOM
Quantity:
101
Company:
Part Number:
ATMEGA8L-8PU
Manufacturer:
ATMEL
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33 600
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Part Number:
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56
8-bit Timer/Counter0
Overview
Registers
Definitions
2486O–AVR–10/04
Timer/Counter0 is a general purpose, single channel, 8-bit Timer/Counter module. The
main features are:
•
•
•
•
A simplified block diagram of the 8-bit Timer/Counter is shown in Figure 26. For the
actual placement of I/O pins, refer to “Pin Configurations” on page 2. 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 locations are listed in the “8-bit Timer/Counter Register Description” on
page 70.
Figure 26. 8-bit Timer/Counter Block Diagram
The Timer/Counter (TCNT0) is an 8-bit register. Interrupt request (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 or via the prescaler, or by an external clock
source on the T0 pin. The Clock Select logic block controls which clock source and edge
the Timer/Counter uses to increment 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
Many register and bit references in this document are written in general form. A lower
case “n” replaces the Timer/Counter number, in this case 0. 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.
The definitions in Table 33 are also used extensively throughout this datasheet.
Table 33. Definitions
BOTTOM
MAX
Single Channel Counter
Frequency Generator
External Event Counter
10-bit Clock Prescaler
T0
).
The counter reaches the BOTTOM when it becomes 0x00
The counter reaches its MAXimum when it becomes 0xFF (decimal 255)
Timer/Counter
TCNTn
count
Control Logic
=
TCCRn
0xFF
clk
Tn
( From Prescaler )
Clock Select
Detector
Edge
ATmega8(L)
TOVn
(Int.Req.)
Tn
67