ATMEGA323-8PI Atmel, ATMEGA323-8PI Datasheet - Page 55
ATMEGA323-8PI
Manufacturer Part Number
ATMEGA323-8PI
Description
IC AVR MCU 32K 8MHZ IND 40DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA323L-4PC.pdf
(247 pages)
Specifications of ATMEGA323-8PI
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
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA3238PI
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ATmega323(L)
Register B – TCCR1B” on page 57. The different Status Flags (Overflow, Compare
Match, and Capture Event) are found in the Timer/Counter Interrupt Flag Register –
TIFR. Control signals are found in the Timer/Counter1 Control Registers – TCCR1A and
TCCR1B. The interrupt enable/disable settings for Timer/Counter1 are found in the
Timer/Counter Interrupt Mask Register – TIMSK.
When Timer/Counter1 is externally clocked, the external signal is synchronized with the
Oscillator frequency of the CPU. To assure proper sampling of the external clock, the
minimum time between two external clock transitions must be at least one internal CPU
clock period. The external clock signal is sampled on the rising edge of the internal CPU
clock.
The 16-bit Timer/Counter1 features both a high-resolution and a high-accuracy usage
with the lower prescaling opportunities. Similarly, the high-prescaling opportunities
makes the Timer/Counter1 useful for lower speed functions or exact timing functions
with infrequent actions.
The Timer/Counter1 supports two Output Compare functions using the Output Compare
Register 1 A and B (OCR1A and OCR1B) as the data sources to be compared to the
Timer/Counter1 contents. The Output Compare functions include optional clearing of
the counter on compareA match, and actions on the Output Compare Pins on both com-
pare matches.
Timer/Counter1 can also be used as an 8-, 9-, or 10-bit Pulse Width Modulator. In this
mode the counter and the OCR1A/OCR1B Registers serve as a dual glitch-free stand-
alone PWM with centered pulses. Alternatively, the Timer/Counter1 can be configured
to operate at twice the speed in PWM mode, but without centered pulses. Refer to page
60 for a detailed description of this function.
The Input Capture function of Timer/Counter1 provides a capture of the Timer/Counter1
contents to the Input Capture Register – ICR1, triggered by an external event on the
Input Capture Pin – ICP. The actual capture event settings are defined by the
Timer/Counter1 Control Register – TCCR1B. In addition, the Analog Comparator can be
set to trigger the Input Capture. Refer to the section, “The Analog Comparator”, for
details on this. The ICP pin logic is shown in Figure 37.
Figure 37. ICP Pin Schematic Diagram
If the noise canceler function is enabled, the actual trigger condition for the capture
event is monitored over four samples, and all four must be equal to activate the Capture
Flag.
55
1457G–AVR–09/03
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