ATMEGA161L-4PC Atmel, ATMEGA161L-4PC Datasheet - Page 56
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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ATmega161(L)
Table 18. Compare1 Mode Select in PWM Mode
Note:
Note that in the PWM mode, the 8, 9 or 10 least significant OCR1A/OCR1B bits
(depends of resolution), when written, are transferred to a temporary location. They are
latched when Timer/Counter1 reaches the value TOP. This prevents the occurrence of
odd-length PWM pulses (glitches) in the event of an unsynchronized OCR1A/OCR1B
write. See Figure 37 and Figure 38 for an example in each mode.
Figure 37. Effects on Unsynchronized OCR1 Latching
Note:
CTC1
Compare Value changes
0
0
0
0
1
1
1
1
1. X = A or B
1. Note: X = A or B
Unsynchronized
COM1X1
Synchronized
0
0
1
1
0
0
1
1
Compare Value changes
COM1X0
0
1
0
1
0
1
0
1
OCR1X Latch
OCR1X Latch
Effect on OCX1
Not connected
Not connected
Cleared on compare match, up-counting. Set on compare
match, down-counting (non-inverted PWM).
Cleared on compare match, down-counting. Set on compare
match, up-counting (inverted PWM).
Not connected
Not connected
Cleared on compare match, set on overflow.
Set on compare match, cleared on overflow.
(1)
Glitch
(1)
Compare Value
PWM Output OC1X
Counter Value
Counter Value
Compare Value
PWM Output OC1X
1228D–AVR–02/07
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