ATMEGA162-16MJ Atmel, ATMEGA162-16MJ Datasheet - Page 56
ATMEGA162-16MJ
Manufacturer Part Number
ATMEGA162-16MJ
Description
IC MCU AVR 16K 5V 16MHZ 44-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA162-16MJ
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
35
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-VQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
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Timed Sequences
for Changing the
Configuration of
the Watchdog
Timer
Safety Level 0
Safety Level 1
Safety Level 2
56
ATmega162/V
The sequence for changing configuration differs slightly between the three safety levels. Sepa-
rate procedures are described for each level.
This mode is compatible with the Watchdog operation found in ATmega161. The Watchdog
Timer is initially disabled, but can be enabled by writing the WDE bit to one without any restric-
tion. The Time-out period can be changed at any time without restriction. To disable an enabled
Watchdog Timer, the procedure described on
In this mode, the Watchdog Timer is initially disabled, but can be enabled by writing the WDE bit
to one without any restriction. A timed sequence is needed when changing the Watchdog Time-
out period or disabling an enabled Watchdog Timer. To disable an enabled Watchdog Timer,
and/or changing the Watchdog Time-out, the following procedure must be followed:
1. In the same operation, write a logic one to WDCE and WDE. A logic one must be written
2. Within the next four clock cycles, in the same operation, write the WDE and WDP bits as
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:
1. In the same operation, write a logical one to WDCE and WDE. Even though the WDE
2. Within the next four clock cycles, in the same operation, write the WDP bits as desired,
to WDE regardless of the previous value of the WDE bit.
desired, but with the WDCE bit cleared.
always is set, the WDE must be written to one to start the timed sequence.
but with the WDCE bit cleared. The value written to the WDE bit is irrelevant.
page 53
(WDE bit description) must be followed.
2513K–AVR–07/09
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