HT46R34 datasheet(21/43 Pages) HOLTEK

21 / 43 page

HT46R32/HT46R34

Rev. 1.10

March 16, 2007

Bit No.

Label

Function

AOF0

AOF1

AOF2

AOF3

OP amp/comparator input offset voltage cancellation control bits

ARS

OP amp/comparator input offset voltage cancellation reference selection bit

1/0 : select OPP/OPN (CP/CN) as the reference input

AOFM

Input offset voltage cancellation mode and OP amp/comparator mode selection

1: input offset voltage cancellation mode

0: OP amp/comparator

OPAOP

OP amp/comparator output; positive logic

OPAEN

OP amp/comparator enable/disable (1/0)

If OP/comparator is disabled, output is floating.

OPAC (1FH) Register

If the OP amp/comparator is disabled, the power consumption will be very small. To ensure that power consumption is

minimised when the device is in the Power-down mode, the OP amp/comparator should be switched off by clearing bit

OPAEN to 0 before entering the Power-down mode.

Configuration Options

The following table shows the various microcontroller configuration options. All of the configuration options must be

properly defined to ensure correct system functioning.

No.

Options

WDT clock source: WDTOSC or T1 (fSYS/4)

WDT function: enable or disable

CLRWDT instruction(s): one or two clear WDT instruction(s)

System oscillator: RC or crystal

Pull-high resistors (PA, PB, PD): none or pull-high

PWM enable or disable

PA0~PA7 wake-up: enable or disable

PFD enable or disable

Low voltage reset selection: enable or disable LVR function.

Comparator or OP selection

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