PIC16F628A-ISLASHML datasheet(66/168 Pages) MICROCHIP

66 / 168 page

PIC16F627A/628A/648A

DS40044A-page 64

Preliminary

 2002 Microchip Technology Inc.

10.5

Comparator Outputs

The comparator outputs are read through the CMCON

outputs may also be directly output to the RA3 and RA4

I/O pins. When the CM<2:0> = 110 or 001, multiplexors

in the output path of the RA3 and RA4/T0CK1 pins will

switch and the output of each pin will be the unsynchro-

nized output of the comparator. The uncertainty of each

of the comparators is related to the input offset voltage

and the response time given in the specifications.

Figure 10-3 shows the comparator output block

diagram.

The TRISA bits will still function as an output enable/

disable for the RA3 and RA4/T0CK1 pins while in this

mode.

FIGURE 10-3:

MODIFIED COMPARATOR OUTPUT BLOCK DIAGRAM

Note 1: When reading the PORT register, all pins

configured as analog inputs will read as a

‘0’. Pins configured as digital inputs will

convert an analog input, according to the

Schmitt Trigger input specification.

2: Analog levels on any pin that is defined as

a digital input may cause the input buffer

to consume more current than is speci-

fied.

To RA3 or RA4/T0CK1 pin

Set CMIF bit

RESET

From other Comparator

To Data Bus

CnV

OUT

CnI

RD CMCON

CMCON<7:6>

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