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CD00001237 Fiches technique(PDF) 22 Page - STMicroelectronics |
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CD00001237 Fiches technique(HTML) 22 Page - STMicroelectronics |
22 / 105 page ST6215C ST6225C 22/105 CLOCK SYSTEM (Cont’d) 5.1.3 Low Frequency Auxiliary Oscillator (LFAO) The Low Frequency Auxiliary Oscillator has three main purposes. Firstly, it can be used to reduce power consumption in non timing critical routines. Secondly, it offers a fully integrated system clock, without any external components. Lastly, it acts as a backup oscillator in case of main oscillator fail- ure. This oscillator is available when the OSG ENA- BLED option is selected in the option byte (refer to the Option Bytes section of this document). In this case, it automatically starts one of its periods after the first missing edge of the main oscillator, what- ever the reason for the failure (main oscillator de- fective, no clock circuitry provided, main oscillator switched off...). See Figure 11. User code, normal interrupts, WAIT and STOP in- structions, are processed as normal, at the re- duced fLFAO frequency. The A/D converter accura- cy is decreased, since the internal frequency is be- low 1.2 MHz. At power on, until the main oscillator starts, the re- set delay counter is driven by the LFAO. If the main oscillator starts before the 2048 cycle delay has elapsed, it takes over. The Low Frequency Auxiliary Oscillator is auto- matically switched off as soon as the main oscilla- tor starts. 5.1.4 Register Description ADC CONTROL REGISTER (ADCR) Address: 0D1h — Read/Write Reset value: 0100 0000 (40h) Bit 7:3, 1:0 = ADCR[7:3], ADCR[1:0] ADC Control Register. These bits are used to control the A/D converter (if available on the device) otherwise they are not used. Bit 2 = OSCOFF Main Oscillator Off. 0: Main oscillator enabled 1: Main oscillator disabled Note: The OSG must be enabled using the OS- GEN option in the Option Byte, otherwise the OS- COFF setting has no effect. 70 ADCR 7 ADCR 6 ADCR 5 ADCR 4 ADCR 3 OSC OFF ADCR 1 ADCR 0 1 |
Numéro de pièce similaire - CD00001237 |
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Description similaire - CD00001237 |
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