ATMEGA16U2-16AU Atmel, ATMEGA16U2-16AU Datasheet - Page 53
ATMEGA16U2-16AU
Manufacturer Part Number
ATMEGA16U2-16AU
Description
8-bit Microcontrollers - MCU 16K Flash
Manufacturer
Atmel
Datasheet
1.ATMEGA16U2-16AU.pdf
(310 pages)
Specifications of ATMEGA16U2-16AU
Product Category
8-bit Microcontrollers - MCU
Rohs
yes
Core
AVR
Data Bus Width
8 bit
Program Memory Size
16 KB
Data Ram Size
1.25 KB
Data Rom Size
512 B
Program Memory Type
Flash
Factory Pack Quantity
1250
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7799D–AVR–11/10
While the WDT prescaler allows only even division factors (2, 4, 8...), the WDT peripheral also
includes a clock divider that directly acts on the clock source. This divider handles odd division
factors (3, 5, 7). In combination with the prescaler, a large number of time-out values can be
obtained.
The divider factor change is also ruled by the secure timed sequence : first the WDE and WDCE
bits must be set, and then four cycles are available to load the new divider value into the
WDTCKD register. Be aware that after this operation WDE will still be set. So keep in mind the
importance of order of operations. When setting up the WDT in Interrupt mode with specific val-
ues of prescaler and divider, the divider register must be loaded before the prescaler register :
The following code example shows one assembly and one C function for turning off the Watch-
dog Timer. The example assumes that interrupts are controlled (e.g. by disabling interrupts
globally) so that no interrupts will occur during the execution of these functions.
1. Set WDCE and WDE
2. Load the divider factor into WDTCKD
3. Wait WDCE being automatically cleared (just wait 2 more cycles)
4. Set again WDCE and WDE
5. Clear WDE, set WDIE and load the prescaler factor into WDTCSR in a same operation
6. Now the system is properly configured for Interrupt only mode. Inverting the two opera-
tions would have been resulted into “Reset and Interrupt mode” and needed a third
operation to clear WDE.
ATmega8U2/16U2/32U2
53
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