ATTINY44A-PU Atmel, ATTINY44A-PU Datasheet - Page 43
ATTINY44A-PU
Manufacturer Part Number
ATTINY44A-PU
Description
IC MCU AVR 4K FLASH 20MHZ 14PDIP
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY44A-PU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
12
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
14-DIP (0.300", 7.62mm)
Processor Series
ATTINY4x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
256 B
Interface Type
SPI/USI
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
12
Number Of Timers
2
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Minimum Operating Temperature
- 40 C
On-chip Adc
20-ch x 10-bit
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRISP2 - PROGRAMMER AVR IN SYSTEM
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8.4.2
8183C–AVR–03/11
Code Example
The following code example shows one assembly and one C function for turning off the WDT.
The example assumes that interrupts are controlled (e.g., by disabling interrupts globally) so that
no interrupts will occur during execution of these functions.
Note:
Assembly Code Example
C Code Example
• Safety Level 2
In this mode, the Watchdog Timer is always enabled, and the WDE bit will always read as
one. A timed sequence is needed when changing the Watchdog Time-out period. To change
the Watchdog Time-out, the following procedure must be followed:
WDT_off:
void WDT_off(void)
{
}
a. In the same operation, write a logical one to WDCE and WDE. Even though the
b. Within the next four clock cycles, in the same operation, write the WDP bits as
wdr
; Clear WDRF in MCUSR
ldi
out
; Write logical one to WDCE and WDE
; Keep old prescaler setting to prevent unintentional Watchdog Reset
in
ori r16, (1<<WDCE)|(1<<WDE)
out WDTCSR, r16
; Turn off WDT
ldi r16, (0<<WDE)
out WDTCSR, r16
ret
_WDR();
/* Clear WDRF in MCUSR */
MCUSR = 0x00
/* Write logical one to WDCE and WDE */
WDTCSR |= (1<<WDCE) | (1<<WDE);
/* Turn off WDT */
WDTCSR = 0x00;
See
WDE always is set, the WDE must be written to one to start the timed sequence
desired, but with the WDCE bit cleared. The value written to the WDE bit is
irrelevant
“Code Examples” on page
r16, WDTCSR
r16, (0<<WDRF)
MCUSR, r16
6.
ATtiny24A/44A/84A
43
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