Z8F021ASH020SC datasheet(150/276 Pages) ZILOG

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PS022815-0206

Comparator

Z8 Encore! XP® 4K Series

Product Specification

131

The comparator may be powered down to reduce supply current. See the Power Control

Because of the propagation delay of the comparator, it is not recommended to enable or

reconfigure the comparator without first disabling interrupts and waiting for the com-

parator output to settle. Doing so can result in spurious interrupts. The following exam-

ple shows how to safely enable the comparator:

ld cmp0, r0 ; load some new configutation

nop

; wait for output to settle

clr irq0 ; clear any spurious interrupts pending

Comparator Control Register Definitions

Comparator Control Register

The Comparator Control Register (CMP0) configures the comparator inputs and sets the

value of the internal voltage reference.

INPSEL—Signal Select for Positive Input

0 = GPIO pin used as positive comparator input

1 = temperature sensor used as positive comparator input

INNSEL—Signal Select for Negative Input

0 = internal reference disabled, GPIO pin used as negative comparator input

1 = internal reference enabled as negative comparator input

REFLVL—Internal Reference Voltage Level (this reference is independent of the ADC

voltage reference). Note that the 8-pin devices contain two additional LSBs for increased

resolution.

For 20-/28-pin devices:

Table 78. Comparator Control Register (CMP0)

BITS

FIELD

INPSEL

INNSEL

REFLVL

Reserved (20-/28-pin)

REFLVL (8-pin)

RESET

001

R/W

R/WR/W

ADDR

F90H

Caution:

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