ATMEGA16HVA-4CKU Atmel, ATMEGA16HVA-4CKU Datasheet - Page 37

• Manufacturer Part Number: ATMEGA16HVA-4CKU
• Description: MCU AVR 16K FLASH 4MHZ 36-LGA
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16HVA-4CKU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 7
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 9 V
• Data Converters: A/D 5x12b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 36-LGA
• Processor Series: ATMEGA16x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: SPI
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRSB200, ATAVRSB201
• Minimum Operating Temperature: - 20 C
• On-chip Adc: 12 bit, 5 Channel
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.5
10.6
10.7
10.7.1
10.7.2
8024A–AVR–04/08
Power-off Mode
Power Reduction Register
Minimizing Power Consumption
Watchdog Timer
Port Pins
Note that if a level triggered interrupt is used for wake-up from Power-save mode, the changed
level must be held for some time to wake up the MCU. Refer to
for details.
When waking up from Power-save mode, there is a delay from the wake-up condition occurs
until the wake-up becomes effective. This allows the clock to restart and become stable after
having been stopped. The wake-up period is defined in
When the SM2..0 bits are written to 100 and the SE bit is set, the SLEEP instruction makes the
CPU shut down the Voltage Regulator, leaving only the Charger Detect Circuitry operational. To
ensure that the MCU enters Power-off mode only when intended, the SLEEP instruction must be
executed within 4 clock cycles after the SM2..0 bits are written. The MCU will reset when return-
ing from Power-off mode.
Note:
The Power Reduction Register (PRR), see
provides a method to stop the clock to individual peripherals to reduce power consumption. The
current state of the peripheral is frozen and the I/O registers can not be read or written.
Resources used by the peripheral when stopping the clock will remain occupied, hence the
peripheral should in most cases be disabled before stopping the clock. Waking up a module,
which is done by clearing the bit in PRR, puts the module in the same state as before shutdown.
Module shutdown can be used in Idle mode and Active mode to significantly reduce the overall
power consumption. In all other sleep modes, the clock is already stopped.
There are several issues to consider when trying to minimize the power consumption in an AVR
controlled system. In general, sleep modes should be used as much as possible, and the sleep
mode should be selected so that as few as possible of the device’s functions are operating. All
functions not needed should be disabled. In particular, the following modules may need special
consideration when trying to achieve the lowest possible power consumption.
If the Watchdog Timer is not needed in the application, the module should be turned off. If the
Watchdog Timer is enabled, it will be enabled in all sleep modes except Power-off. The Watch-
dog Timer current consumption is significant only in Power-save mode. Refer to
Timer” on page 46
When entering a sleep mode, all port pins should be configured to use minimum power. The
most important is then to ensure that no pins drive resistive loads. In sleep modes where both
the I/O clock (clk
be disabled. This ensures that no power is consumed by the input logic when not needed. In
some cases, the input logic is needed for detecting wake-up conditions, and it will then be
enabled. Refer to the section
which pins are enabled. If the input buffer is enabled and the input signal is left floating or have
an analog signal level close to V
Before entering Power-off sleep mode, interrupts should be disabled by software. Otherwise inter-
rupts may prevent the SLEEP instruction from being executed within the time limit.
I/O
for details on how to configure the Watchdog Timer.
) and the ADC clock (clk
”Digital Input Enable and Sleep Modes” on page 67
REG
/2, the input buffer will use excessive power.
ADC
”PRR0 – Power Reduction Register 0” on page
) are stopped, the input buffers of the device will
ATmega8HVA/16HVA
”Clock Sources” on page
”External Interrupts” on page 56
25.
for details on
”Watchdog
39,
37