PIC16F-ESLASHML datasheet(66/178 Pages) MICROCHIP

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PIC16F627A/628A/648A

DS40044F-page 64

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/CMP2

pins will switch and the output of each pin will be the

unsynchronized

output

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/AN3/CMP1 and RA4/T0CK1/

CMP2 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

consume

current

than

specified.

To RA3/AN3/CMP1 or

Set CMIF bit

Reset

From other Comparator

To Data Bus

CnVOUT

CnINV

RD CMCON

CMCON<7:6>

RA4/T0CK1/CMP2 pin

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