HT85F2270 datasheet(172/226 Pages) HOLTEK

172 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

CP0CR Register

SFR Address: DEh

Bit

Name

—

CP0ON

CP0POL

CP0OUT

CP0OS

CP0RSTL

CP0RST

—

R/W

—

R/W

—

POR

—

Bit 7

Unimplemented, read as “0”

Bit 6

CP0ON: Comparator 0 On/Off control

0: Off

1: On

This is the Comparator 0 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 Power-Down or IDLE mode.

Bit 5

CP0POL: Comparator 0 output polarity

0: Output not inverted

1: Output inverted

This is the comparator 0 polarity bit. If the bit is zero then the CP0OUT bit will reflect

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

CP0OUT bit will be inverted.

Bit 4

CP0OUT: Comparator 0 output bit

CP0POL=0

0: CP0+ < CP0-

1: CP0+ > CP0-

CP0POL=1

0: CP0+ > CP0-

1: CP0+ < CP0-

This bit stores the comparator 0 output bit. The polarity of the bit is determined by the

voltages on the comparator 0 inputs and by the condition of the CP0POL bit.

Bit 3

CP0OS: Comparator 0 output path select

0: C0OUT pin

1: Internal use

This is the comparator 0 output path select control bit. If the bit is set to “0” and the

CP0ON bit is “1” the comparator 0 output is connected to an external C0OUT pin. If

the bit is set to “1” or the CP0ON bit is “1” the comparator 0 output signal is only used

internally by the device allowing the shared comparator output pin to retain its normal

I/O operation.

Bit 2

CP0RSTL: Output reset signal select

0: CP0OUT=0 will reset the MCU

1: CP0OUT=1 will reset the MCU

The CP0RST bit should be set high first to enable this function.

Bit 1

CP0RST: Comparator 0 output to reset MCU function control

0: Disable

1: Enable

Bit 0

Unimplemented, read as “0”

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