ST6200C ST6201C ST6203C
A/D CONVERTER (Cont’d)
8.3.5 Low Power Modes
No effect on A/D Converter. ADC interrupts
cause the device to exit from Wait mode.
A/D Converter disabled.
Note: The A/D converter may be disabled by clear-
ing the PDS bit. This feature allows reduced power
consumption when no conversion is needed.
End of Conver-
Note: The EOC bit is cleared only when a new
conversion is started (it cannot be cleared by writ-
ing 0). To avoid generating further EOC interrupt,
the EAI bit has to be cleared within the ADC inter-
8.3.7 Register Description
A/D CONVERTER CONTROL REGISTER (AD-
Address: 0D1h - Read/Write (Bit 6 Read Only, Bit
5 Write Only)
Reset value: 0100 0000 (40h)
Bit 7 = EAI Enable A/D Interrupt.
0: ADC interrupt disabled
1: ADC interrupt enabled
Bit 6 = EOC End of conversion. Read Only
When a conversion has been completed, this bit is
set by hardware and an interrupt request is gener-
ated if the EAI bit is set. The EOC bit is automati-
Table 14. ADC Register Map and Reset Values
cally cleared when the STA bit is set. Data in the
data conversion register are valid only when this
bit is set to “1”.
0: Conversion is not complete
1: Conversion can be read from the ADR register
Bit 5 = STA: Start of Conversion. Write Only.
0: No effect
1: Start conversion
Note: Setting this bit automatically clears the EOC
bit. If the bit is set again when a conversion is in
progress, the present conversion is stopped and a
new one will take place. This bit is write only, any
attempt to read it will show a logical zero.
Bit 4 = PDS Power Down Selection.
0: A/D converter is switched off
1: A/D converter is switched on
Bit 3 = ADCR3 Reserved, must be cleared.
Bit 2 = OSCOFF Main Oscillator off.
0: Main Oscillator enabled
1: Main Oscillator disabled
Note: This bit does not apply to the ADC peripher-
al but to the main clock system. Refer to the Clock
Bits 1:0 = ADCR[1:0] Reserved, must be cleared.
A/D CONVERTER DATA REGISTER (ADR)
Address: 0D0h - Read only
Reset value: xxxx xxxx (xxh)
ADR7 ADR6 ADR5 ADR4 ADR3 ADR2 ADR1 ADR0
Bits 7:0 = ADR[7:0]: 8 Bit A/D Conversion Result.
Doc ID 4563 Rev 5