ATMEGA64A-MNR Atmel, ATMEGA64A-MNR Datasheet - Page 105
ATMEGA64A-MNR
Manufacturer Part Number
ATMEGA64A-MNR
Description
IC MCU AVR 64K FLASH 8QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA64A-AU.pdf
(392 pages)
Specifications of ATMEGA64A-MNR
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
53
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
2 KB
Interface Type
SPI, UART, I2C
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
53
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 105 C
Mounting Style
SMD/SMT
Operating Temperature Range
- 40 C to + 85 C
Processor To Be Evaluated
ATMEGA64A
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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14.10 Timer/Counter Prescaler
8160C–AVR–07/09
Figure 14-12. Prescaler for Timer/Counter0
The clock source for Timer/Counter0 is named clk
system clock clk
from the TOSC1 pin. This enables use of Timer/Counter0 as a Real Time Counter (RTC). When
AS0 is set, pins TOSC1 and TOSC2 are disconnected from Port C. A crystal can then be con-
nected between the TOSC1 and TOSC2 pins to serve as an independent clock source for
Timer/Counter0. The Oscillator is optimized for use with a 32.768 kHz crystal. Applying an exter-
nal clock source to TOSC1 is not recommended.
For Timer/Counter0, the possible prescaled selections are: clk
clk
Setting the PSR0 bit in SFIOR resets the prescaler. This allows the user to operate with a pre-
dictable prescaler.
T0S
/128, clk
TOSC1
clk
PSR0
CS00
CS01
CS02
AS0
T0S
OSC
OSC
/256, and clk
. By setting the AS0 bit in ASSR, Timer/Counter0 is asynchronously clocked
T0S
clk
/1024. Additionally, clk
T0S
Clear
TIMER/COUNTER0 CLOCK SOURCE
0
T0S
10-BIT T/C PRESCALER
. clk
T0S
clk
T0S
T0
as well as 0 (stop) may be selected.
is by default connected to the main
T0S
/8, clk
ATmega64A
T0S
/32, clk
T0S
/64,
105
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