ata5773 ATMEL Corporation, ata5773 Datasheet - Page 85
ata5773
Manufacturer Part Number
ata5773
Description
Microcontroller With Uhf Ask/fsk Transmitter
Manufacturer
ATMEL Corporation
Datasheet
1.ATA5773.pdf
(284 pages)
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7.1.2
7.1.3
7.1.4
7.2
8006G–AVR–01/08
Software BOD Disable
ADC Noise Reduction Mode
Power-Down Mode
Standby Mode
Idle mode enables the MCU to wake up from external triggered interrupts as well as internal
ones like the Timer Overflow. If wake-up from the Analog Comparator interrupt is not required,
the Analog Comparator can be powered down by setting the ACD bit in
parator Control and Status Register” on page
mode. If the ADC is enabled, a conversion starts automatically when this mode is entered.
When the SM1..0 bits are written to 01, the SLEEP instruction makes the MCU enter ADC Noise
Reduction mode, stopping the CPU but allowing the ADC, the external interrupts, and the
Watchdog to continue operating (if enabled). This sleep mode halts clk
while allowing the other clocks to run.
This improves the noise environment for the ADC, enabling higher resolution measurements. If
the ADC is enabled, a conversion starts automatically when this mode is entered. Apart form the
ADC Conversion Complete interrupt, only an External Reset, a Watchdog Reset, a Brown-out
Reset, an SPM/EEPROM ready interrupt, an external level interrupt on INT0 or a pin change
interrupt can wake up the MCU from ADC Noise Reduction mode.
When the SM1:0 bits are written to 10, the SLEEP instruction makes the MCU enter Power-
down mode. In this mode, the Oscillator is stopped, while the external interrupts, and the Watch-
dog continue operating (if enabled). Only an External Reset, a Watchdog Reset, a Brown-out
Reset, an external level interrupt on INT0, or a pin change interrupt can wake up the MCU. This
sleep mode halts all generated clocks, allowing operation of asynchronous modules only.
When the SM1..0 bits are 11 and an external crystal/resonator clock option is selected, the
SLEEP instruction makes the MCU enter Standby mode. This mode is identical to Power-down
with the exception that the Oscillator is kept running. From Standby mode, the device wakes up
in six clock cycles.
When the Brown-out Detector (BOD) is enabled by BODLEVEL fuses (see
160), the BOD is actively monitoring the supply voltage during a sleep period. In some devices it
is possible to save power by disabling the BOD by software in Power-Down and Stand-By sleep
modes. The sleep mode power consumption will then be at the same level as when BOD is glob-
ally disabled by fuses.
If BOD is disabled by software, the BOD function is turned off immediately after entering the
sleep mode. Upon wake-up from sleep, BOD is automatically enabled again. This ensures safe
operation in case the V
When the BOD has been disabled, the wake-up time from sleep mode will be approximately
60µs to ensure that the BOD is working correctly before the MCU continues executing code.
BOD disable is controlled by the BODS (BOD Sleep) bit of MCU Control Register, see
– MCU Control Register” on page
Stand-By, while writing a zero keeps the BOD active. The default setting is zero, i.e. BOD active.
Writing to the BODS bit is controlled by a timed sequence and an enable bit, see
MCU Control Register” on page
CC
level has dropped during the sleep period.
35.
35. Writing this bit to one turns off BOD in Power-Down and
130. This will reduce power consumption in Idle
ATtiny24/44/84
I/O
“ACSR – Analog Com-
, clk
Table 19-4 on page
CPU
, and clk
“MCUCR –
“MCUCR
FLASH
33
,
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