HC705JJ7GRSSLASHD datasheet(116/230 Pages) NXP

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Analog Subsystem

General Release Specification

MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0

Analog Subsystem

CPFR2

Writing a logical one to this write-only flag clears the CPF2 flag in the

ASR. Writing a logical zero to this bit has no effect. Reading the

CPFR2 bit will return a logical zero. By default, this bit looks cleared

following a reset of the device.

1 = Clears the CPF2 flag bit

0 = No effect

CPFR1

Writing a logical one to this write-only flag clears the CPF1 flag in the

ASR. Writing a logical zero to this bit has no effect. Reading the

CPFR1 bit will return a logical zero. By default, this bit looks cleared

after a reset of the device.

1 = Clears the CPF1 flag bit

0 = No effect

NOTE:

The CPFR1 and CPFR2 bits should be written with logical ones following

a power up of either comparator. This will clear out any latched CPF1 or

CPF2 flag bits which might have been set during the slower power up

sequence of the analog circuitry.

If both inputs to a comparator are above the maximum common-mode

input voltage (VDD –1.5V) the output of the comparator is indeterminate

and may set the comparator flag. Applying a reset to the device may only

temporarily clear this flag as long as both inputs of a comparator remain

above the maximum common-mode input voltages.

VOFF

This read-write bit controls the addition of an offset voltage to the

bottom of the sample capacitor. It is not active unless the OPT bit in

the COPR at location $1FF0 is set. Any reads of the VOFF bit location

return a logical zero if the OPT bit is clear. During the time that the

sample capacitor is connected to an input (either HOLD or DHOLD

set) the bottom of the sample capacitor is connected to VSS. The

VOFF bit is cleared by a reset of the device. For more information see

8.11 Sample and Hold.

1 = Enables approximately 100 mV offset to be added to the

sample voltage when both the HOLD and DHOLD control bits

are cleared

0 = Connects the bottom of the sample capacitor to VSS

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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