ATMEGA323-8AI Atmel, ATMEGA323-8AI Datasheet - Page 64
![IC AVR MCU 32K 8MHZ IND 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA323-8AI
Manufacturer Part Number
ATMEGA323-8AI
Description
IC AVR MCU 32K 8MHZ IND 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA323L-4PC.pdf
(247 pages)
Specifications of ATMEGA323-8AI
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
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA3238AI
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Watchdog Timer
The Watchdog Timer Control
Register – WDTCR
64
ATmega323(L)
The Watchdog Timer is clocked from a separate On-chip Oscillator which runs at 1 Mhz.
This is the typical value at V
V
can be adjusted as shown in Table 24 on page 65. The WDR – Watchdog Reset –
instruction resets the Watchdog Timer. Eight different clock cycle periods can be
selected to determine the reset period. If the reset period expires without another
Watchdog Reset, the ATmega323 resets and executes from the Reset Vector. For tim-
ing details on the Watchdog Reset, refer to page 30.
To prevent unintentional disabling of the Watchdog, a special turn-off sequence must be
followed when the Watchdog is disabled. Refer to the description of the Watchdog Timer
Control Register for details.
Figure 40. Watchdog Timer
• Bits 7..5 – Res: Reserved Bits
These bits are reserved bits in the ATmega323 and will always read as zero.
• Bit 4 – WDTOE: Watchdog Turn-off Enable
This bit must be set (one) when the WDE bit is cleared. Otherwise, the Watchdog will
not be disabled. Once set, hardware will clear this bit to zero after four clock cycles.
Refer to the description of the WDE bit for a Watchdog disable procedure.
• Bit 3 – WDE: Watchdog Enable
When the WDE is set (one) the Watchdog Timer is enabled, and if the WDE is cleared
(zero) the Watchdog Timer function is disabled. WDE can only be cleared if the WDTOE
bit is set(one). To disable an enabled Watchdog timer, the following procedure must be
followed:
Bit
$21 ($41)
Read/Write
Initial Value
CC
levels. By controlling the Watchdog Timer prescaler, the Watchdog Reset interval
R
7
–
0
1 MHz at V
OSCILLATOR
R
6
–
0
CC
CC
= 5V
= 5V. See characterization data for typical values at other
R
5
–
0
WDTOE
R/W
4
0
WDE
R/W
3
0
WDP2
R/W
2
0
WDP1
R/W
1
0
WDP0
R/W
1457G–AVR–09/03
0
0
WDTCR
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