HT66F016 datasheet(83/116 Pages) HOLTEK

83 / 116 page

HT66F016/HT66F017/HT68F016/HT68F017

Rev. 1.00

May 14, 2012

· CPC Register

Bit

76543210

Name

CSEL

CEN

CPOL

COUT

COS

¾¾

CHYEN

R/W

¾¾

R/W

POR

10000

¾¾

Bit 7

CSEL: Select Comparator pins or I/O pins

0: I/O pin select

1: Comparator pin select

This is the Comparator pin or I/O pin select bit. If the bit is high the comparator will be selected

and the two comparator input pins will be enabled. As a result, these two pins will lose their I/O

pin functions. Any pull-high configuration options associated with the comparator shared pins will

also be automatically disconnected.

Bit 6

CEN: Comparator On/Off control

0: Off

1: On

This is the Comparator on/off control bit. If the bit is zero the comparator will be switched off

and no power consumed even if analog voltages are applied to its inputs. For power sensitive

applications this bit should be cleared to zero if the comparator is not used or before the device

enters the SLEEP or IDLE mode.

Bit 5

CPOL: Comparator output polarity

0: output not inverted

1: output inverted

This is the comparator polarity bit. If the bit is zero then the COUT bit will reflect the

non-inverted output condition of the comparator. If the bit is high the comparator COUT bit will

be inverted.

Bit 4

COUT: Comparator output bit

CPOL=0

0: C+ < C-

1: C+ > C-

CPOL=1

0: C+ > C-

1: C+ < C-

This bit stores the comparator output bit. The polarity of the bit is determined by the voltages

on the comparator inputs and by the condition of the CPOL bit.

Bit 3

CS: Output path select

0: CX pin

1: Internal use

This is the comparator output path select control bit. If the bit is set to

²0² and the CSEL bit is

²1² the comparator output is connected to an external CX pin. If the bit is set to ²1² or the

CSEL bit is

²0² the comparator output signal is only used internally by the device allowing the

shared comparator output pin to retain its normal I/O operation.

Bit 2~1

unimplemented, read as

²0²

Bit 0

CHYEN: Hysteresis Control

0: Off

1: On

This is the hysteresis control bit and if set high will apply a limited amount of hysteresis to the

comparator, as specified in the Comparator Electrical Characteristics table. The positive feedback

induced by hysteresis reduces the effect of spurious switching near the comparator threshold.

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