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dsPIC30F1010/202X

DS70178C-page 188

Preliminary

2006 Microchip Technology Inc.

16.18 Module Power-Down Modes

The module has two internal power modes.

When the ADON bit is ‘1’, the module is in Active mode

and is fully powered and functional.

When ADON is ‘0’, the module is in Off mode. The state

machine for the module is reset, as are all of the

pending conversion requests.

To return to the Active mode from Off mode, the user

must wait for the bias generators to stabilize. The

stabilization time is specified in the electrical specs.

16.19 Effects of a Reset

A device Reset forces all registers to their Reset state.

This forces the ADC module to be turned off, and any

conversion and sampling sequence is aborted. The

value that is in the ADCBUFx register is not modified.

The ADCBUFx registers contain unknown data after a

Power-on Reset.

16.20 Configuring Analog Port Pins

The use of the ADPCFG and TRIS registers control the

operation of the A/D port pins.

The port pins that are desired as analog inputs should

have their corresponding TRIS bit set (input). If the

TRIS bit is cleared (output), the digital output level (VOH

or VOL) will be converted.

Port pins that are desired as analog inputs must have

the corresponding ADPCFG bit clear. This will config-

ure the port to disable the digital input buffer. Analog

levels on pins where ADPCFG<n> = 1, may cause the

digital input buffer to consume excessive current.

If a pin is not configured as an analog input

ADPCFG<n> = 1, the analog input is forced to AVss,

and conversions of that input do not yield meaningful

results.

When reading the PORT register, all pins configured as

analog input ADPCFG<n> = 0 will read ‘0’.

The A/D operation is independent of the state of the

input selection bits and the TRIS bits.

16.21 Output Formats

The A/D converts 10 bits. The data buffer RAM is 16

bits wide. The ADC data can be read in one of two dif-

ferent formats, as shown in Figure 16-5. The FORM bit

selects the format. Each of the output formats

translates to a 16-bit result on the data bus.

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