ATMEGA323-8PC Atmel, ATMEGA323-8PC Datasheet - Page 61
![IC AVR MCU 32K 8MHZ COM 40DIP](/photos/6/70/67049/453-40-dip_sml.jpg)
ATMEGA323-8PC
Manufacturer Part Number
ATMEGA323-8PC
Description
IC AVR MCU 32K 8MHZ COM 40DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA323L-4PC.pdf
(247 pages)
Specifications of ATMEGA323-8PC
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
32
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA3238PC
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1457G–AVR–09/03
Table 20. Timer TOP Values and PWM Frequency
As shown in Table 20, the PWM operates at either 8, 9, or 10 bits resolution. Note the
unused bits in OCR1A, OCR1B, and TCNT1 will automatically be written to zero by
hardware. I.e., bit 9 to 15 will be set to zero in OCR1A, OCR1B, and TCNT1 if the 9-bit
PWM resolution is selected. This makes it possible for the user to perform Read-Modify-
Write operations in any of the three resolution modes and the unused bits will be treated
as don’t care.
Table 21. Timer TOP Values and PWM Frequency
Table 22. Compare1 Mode Select in PWM Mode
Note:
Note that in the PWM mode, the 8, 9, or 10 least significant OCR1A/OCR1B bits
(depending on 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 38 and Figure 39 for an example in each mode.
CTC1
CTC1
0
0
0
1
1
1
0
0
0
0
1
1
1
1
PWM Resolution
1. X = A or B
PWM11
COM1X1
10-bit
8-bit
9-bit
0
1
1
0
1
1
0
0
1
1
0
0
1
1
PWM10
COM1X0
1
0
1
1
0
1
0
1
0
1
0
1
0
1
PWM Resolution
Effect on OCX1
Not connected
Reserved
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
Reserved
Cleared on Compare Match, set on overflow.
Set on Compare Match, cleared on overflow.
Timer TOP Value
$03FF(1023)
$00FF (255)
$01FF (511)
10-bit
10-bit
8-bit
9-bit
8-bit
9-bit
(1)
Timer TOP Value
$03FF(1023)
$03FF(1023)
$00FF (255)
$01FF (511)
$00FF (255)
$01FF (511)
ATmega323(L)
Frequency
f
f
f
TC1
TC1
TC1
/1022
/2046
/510
Frequency
f
f
f
f
TCK1
TCK1
f
f
TCK1
TCK1
TCK1
TCK1
/1022
/2046
/1024
/510
/256
/512
61
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