ATMEGA323-8AC Atmel, ATMEGA323-8AC Datasheet - Page 51

• Manufacturer Part Number: ATMEGA323-8AC
• Description: IC AVR MCU 32K 8MHZ COM 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA323-8AC

• 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: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: ATMEGA3238AC

1457G–AVR–09/03
Figure 34. Effects of Unsynchronized OCR Latching in Up/Down Mode
Figure 35. Effects of Unsynchronized OCR Latching in Overflow Mode
Note:
During the time between the write and the latch operation, a read from the Output Com-
pare Registers will read the contents of the temporary location. This means that the
most recently written value always will read out of OCR0 and OCR2.
When the Output Compare Register contains $00 or $FF, and the up/down PWM mode
is selected, the output PB3(OC0/PWM0)/PD7(OC2/PWM2) is updated to low or high on
the next compare match according to the settings of COMn1/COMn0. This is shown in
Table 16. In overflow PWM mode, the output PB3(OC0/PWM0)/PD7(OC2/PWM2) is
held low or high only when the Output Compare Register contains $FF.
Compare Value changes
n = 0 or 2 (Figure 34 and Figure 35).
Compare Value changes
Unsynchronized OCn Latch
Synchronized OCn Latch
Synchronized OCn Latch
Unsynchronized OCn Latch
Compare Value changes
Glitch
Compare Value changes
Glitch
ATmega323(L)
Counter Value
Compare Value
PWM Output OCn
Counter Value
Compare Value
PWM Output OCn
Counter Value
Compare Value
PWM Output OCn
Counter Value
Compare Value
PWM Output OCn
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