ATMEGA161L-4PC Atmel, ATMEGA161L-4PC Datasheet - Page 38
ATMEGA161L-4PC
Manufacturer Part Number
ATMEGA161L-4PC
Description
IC AVR MCU 16K LV 4MHZ COM 40DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA161-8AC.pdf
(159 pages)
Specifications of ATMEGA161L-4PC
Core Processor
AVR
Core Size
8-Bit
Speed
4MHz
Connectivity
SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
35
Program Memory Size
16KB (8K 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
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
-
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Timer/Counters
Timer/Counter
Prescalers
38
ATmega161(L)
The ATmega161 provides three general purpose Timer/Counters – two 8-bit T/Cs and
one 16-bit T/C. Timer/Counter2 can optionally be asynchronously clocked from an exter-
nal Oscillator. This Oscillator is optimized for use with a 32.768 kHz watch crystal,
enabling use of Timer/Counter2 as a Real-time Clock (RTC). Timer/Counters 0 and 1
have individual prescaling selection from the same 10-bit prescaling timer.
Timer/Counter2 has its own prescaler. Both these prescalers can be Reset by setting
the corresponding control bits in the Special Functions IO Register (SFIOR). Refer to
page 39 for a detailed description. These Timer/Counters can either be used as a timer
with an internal clock time base or as a counter with an external pin connection, which
triggers the counting.
Figure 29. Prescaler for Timer/Counter0 and 1
For Timer/Counters 0 and 1, the four prescaled selections are: CK/8, CK/64, CK/256,
and CK/1024, where CK is the Oscillator clock. For the two Timer/Counters 0 and 1, CK,
external source and stop can also be selected as clock sources. Setting the PSR10 bit
in SFIOR Resets the prescaler. This allows the user to operate with a predictable pres-
caler. Note that Timer/Counter1 and Timer/Counter0 share the same prescaler and a
Prescaler Reset will affect both Timer/Counters.
PSR10
TCK1
Clear
TCK0
1228D–AVR–02/07
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