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Semiconductor Group 5 - 5

On-Chip Peripheral Components

Special Function Registers ADCON0, ADCON1

The reset value of ADCON0 and ADCON1 is 00

Bit Function

ADEX Internal / external start of conversion.

When set, the external start of conversion by P6.0 / ADST

is enabled.

BSY Busy flag.

This flag indicates whether a conversion is in progress (BSY = 1). The flag is

cleared by hardware when the conversion is finished.

ADM A/D Conversion mode.

When set, a continous conversion is selected.

If cleared, the converter stops after one conversion.

MX3 - MX0 Select 12 input channels of the ADC.

Bits MX0 to MX2 con be written or read either in ADCON0 or in ADCON1.

ADCL ADC Clock.

When set

ADC

= f

OSC

/ 16. Has to be set when f

OSC

> 16 MHz

76543210

MSB LSB

Bit No.

76543210

MSB LSB

Bit No.

ADCON0

ADCON1

Addr. 0D8

Addr. 0DC

These bits are not used in controlling A/D converter functions in the 80C517A

BD CLK ADEX BSY ADM MX2 MX1 MX0

MX2 MX1 MX0ADCL MX3

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 136 137

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Siemens EF 88H Series Manual de usuario Pagina 40