ATMEGA323L-4AI Atmel, ATMEGA323L-4AI Datasheet - Page 48
![IC AVR MCU 32K LV 4MZ IND 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA323L-4AI
Manufacturer Part Number
ATMEGA323L-4AI
Description
IC AVR MCU 32K LV 4MZ IND 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA323L-4PC.pdf
(247 pages)
Specifications of ATMEGA323L-4AI
Core Processor
AVR
Core Size
8-Bit
Speed
4MHz
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)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA323L4AI
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48
ATmega323(L)
• Bit 3 – CTC0/CTC2: Clear Timer/Counter on Compare Match
When the CTC0 or CTC2 control bit is set (one), Timer/Counter0 or Timer/Counter2 is
reset to $00 in the CPU clock cycle following a Compare Match. If the control bit is
cleared, the Timer/Counter continues counting and is unaffected by a Compare Match.
When a prescaling of 1 is used, and the Compare Register is set to C, the timer will
count as follows if CTC0/CTC2 is set:
... | C-1 | C | 0 | 1 | ...
When the prescaler is set to divide by 8, the timer will count like this:
... | C-1, C-1, C-1, C-1, C-1, C-1, C-1, C-1 | C, C, C, C, C, C, C, C | 0, 0, 0, 0, 0, 0, 0, 0 |
1, 1, 1, ...
In PWM mode, this bit has a different function. If the CTC0 or CTC2 bit is cleared in
PWM mode, the Timer/Counter acts as an up/down counter. If the CTC0 or CTC2 bit is
set (one), the Timer/Counter wraps when it reaches $FF. Refer to page 49 for a detailed
description.
• Bits 2, 1, 0 – CS02, CS01, CS00/ CS22, CS21, CS20: Clock Select bits 2, 1, and 0
The Clock Select bits 2, 1, and 0 define the prescaling source of Timer/Counter0 and
Timer/Counter2.
Table 13. Clock 0 Prescale Select
Table 14. Clock 2 Prescale Select
CS02
CS22
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
CS01
CS21
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
CS00
CS20
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Description
Stop, the Timer/Counter0 is Stopped
CK
CK/8
CK/64
CK/256
CK/1024
External Pin PB0(T0), Falling Edge
External Pin PB0(T0), Rising Edge
Description
Stop, the Timer/Counter2 is Stopped
PCK2
PCK2/8
PCK2 /32
PCK2/64
PCK2/128
PCK2/256
PCK2/1024
1457G–AVR–09/03
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