HT45F43 datasheet(107/152 Pages) HOLTEK

107 / 152 page

OPA2 I/O status description:

The following table illustrates the OPA2 I/O settings.

· HT45F23/HT45F43

A2EN

PGAEN

A2NS

A2PS

IO2(A2N), IO3(A2P), IO4(A2E)

IO2, IO3, IO4 are I/Os

1000

IO2, IO3 are I/Os. A2E is OPA2 output

1001

IO2 is I/O. A2P is OPA2 input, A2E is OPA2 output

1010

IO3 is I/O. A2N is OPA2 input, A2E is OPA2 output

1011

A2N, A2P are OPA2 inputs, A2E is OPA2 output

1100

IO3 are I/O. A2N is OPA2 input. A2E is OPA2 output

1101

A2N, A2P are OPA2 inputs, A2E is OPA2 output

1110

IO3 is I/O. A2N is OPA2 input. A2E is OPA2 output

1111

A2N, A2P are OPA2 inputs, A2E is OPA2 output

Comparators

Two analog comparators are contained within this device. These functions offer flexibility via their

pins, the comparators do not waste precious I/O pins if there functions are otherwise unused. In

addition, the HT45F23 provides the calibration function to adjust the comparator offset.

Comparator Operation

The devices contain two comparator functions which are used to compare two analog voltages and

provide an output based on their difference. Full control over the two internal comparators is provided

via control registers, CMP1C0, CMP1C1, CMP2C0 and CMP2C1. The comparator output is recorded

via a bit in their respective control register, but can also be transferred out onto a shared I/O pin or to

generate an interrupt trigger with edge control function. Additional comparator functions include the

power down control.

Comparator Registers

The internal dual comparators are fully under the control of internal registers, CMP1C0, CMP1C1,

CMP2C0 and CMP2C1. These registers control enable/disable function, input path selection, interrupt

edge control and input offset voltage calibration function.

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

Rev. 1.20

107

September 15, 2011

HT45F43 Datasheet(PDF) 107 Page - Holtek Semiconductor Inc

HT45F43 Datasheet(HTML) 107 Page - Holtek Semiconductor Inc

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