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ATA5782 Datasheet(PDF) 11 Page - ATMEL Corporation |
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ATA5782 Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 20 page 11 Atmel ATA5781 [Summary DATASHEET] 9286BS–RKE–06/13 The initial settings are stored in the EEPROM and copied during firmware initialization to the SRAM. This allows modification of the PollingMode timing and service/channel configuration during IDLEMode. The tune and check mode (TCMode) offers calibration and self-checking functionality for the VCO and FRC oscillators as well as for temperature measurement, and polling cycle accuracy. This mode is activated via the SPI command “Calibrate and Check”. When selected in the EEPROM settings, tune and check tasks are also used during system initialization after power- on. Furthermore, they can also be activated periodically during PollingMode. Table 2-1 shows the relations between the operating modes and their corresponding power supplies, clock sources, and sleep mode settings. Notes: 1. During IDLEMode(RC) and IDLEMode(XTO) the AVR microcontroller enters sleep mode to reduce current con- sumption. The sleep mode of the microcontroller section can be defined in the EEPROM. The power-down mode is recommended for keeping current consumption low. Table 2-1. Operating Modes versus Power Supplies and Oscillators Operation Mode AVR Sleep Mode DVCC AVCC XTO SRC FRC OFFMode - off off off off off IDLEMode(RC) Active mode Power-down(1) on off off off off on on on off IDLEMode(XTO) Active mode Power-down(1) on on on on on on off off RXMode Active mode on on on off PollingMode(RC) - Active period - Sleep period Active mode Power-down(1) on off on off on on on off PollingMode(XTO) - Active period - Sleep period Active mode Power-down(1) on on on on on on off off |
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