ATMEGA162L-8MI Atmel, ATMEGA162L-8MI Datasheet - Page 50

• Manufacturer Part Number: ATMEGA162L-8MI
• Description: IC MCU AVR 16K 3V 8MHZ 44-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA162L-8MI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• 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: Contains lead / RoHS non-compliant
• Data Converters: -

Internal Voltage
Reference
Voltage Reference Enable
Signals and Start-up Time
Watchdog Timer
50
ATmega162(V/U/L)
• Bit 2 – BORF: Brown-out Reset Flag
This bit is set if a Brown-out Reset occurs. The bit is reset by a Power-on Reset, or by
writing a logic zero to the flag.
• Bit 1 – EXTRF: External Reset Flag
This bit is set if an External Reset occurs. The bit is reset by a Power-on Reset, or by
writing a logic zero to the flag.
• Bit 0 – PORF: Power-on Reset Flag
This bit is set if a Power-on Reset occurs. The bit is reset only by writing a logic zero to
the flag.
To make use of the Reset Flags to identify a reset condition, the user should read and
then Reset the MCUCSR as early as possible in the program. If the register is cleared
before another reset occurs, the source of the Reset can be found by examining the
Reset Flags.
ATmega162 features an internal bandgap reference. This reference is used for Brown-
out Detection, and it can be used as an input to the Analog Comparator.
The voltage reference has a start-up time that may influence the way it should be used.
The start-up time is given in Table 21. To save power, the reference is not always turned
on. The reference is on during the following situations:
1. When the BOD is enabled (by programming the BODLEVEL Fuses).
2. When the bandgap reference is connected to the Analog Comparator (by setting
Thus, when the BOD is not enabled, after setting the ACBG bit, the user must always
allow the reference to start up before the output from the Analog Comparator is used. To
reduce power consumption in Power-down mode, the user can avoid the two conditions
above to ensure that the reference is turned off before entering Power-down mode.
Table 21. Internal Voltage Reference Characteristics
The Watchdog Timer is clocked from a separate On-chip Oscillator which runs at
1 MHz. This is the typical frequency at V
values at other V
Reset interval can be adjusted as shown in Table 23 on page 52. The WDR – Watchdog
Reset – instruction resets the Watchdog Timer. The Watchdog Timer is also reset when
it is disabled and when a Chip Reset occurs. Eight different clock cycle periods can be
selected to determine the reset period. If the reset period expires without another
Watchdog Reset, the ATmega162 resets and executes from the Reset Vector. For tim-
ing details on the Watchdog Reset, refer to page 52.
To prevent unintentional disabling of the Watchdog or unintentional change of time-out
period, 3 different safety levels are selected by the Fuses M161C and WDTON as
Symbol
V
t
I
the ACBG bit in ACSR).
BG
BG
BG
Parameter
Bandgap reference voltage
Bandgap reference start-up time
Bandgap reference current
consumption
CC
levels. By controlling the Watchdog Timer prescaler, the Watchdog
CC
= 5V. See characterization data for typical
Min.
Typ.
1.1
40
10
Max.
70
2513C–AVR–09/02
Units
µA
µs
V