HT46R017 datasheet(59/91 Pages) HOLTEK

59 / 91 page

Rev. 1.00

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Rev. 1.00

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HT46R016/HT46R017

Enhanced A/D 8-Bit OTP MCU

● Step 6

The analog to digital conversion process can now be initialised by setting the START bit in

the ADCR0 register from "0" to "1" and then to "0" again. Note that this bit should have been

originally set to "0".

● Step 7

To check when the analog to digital conversion process is complete, the EOCB bit in the ADCR0

occurs the A/D data registers ADRL and ADRH can be read to obtain the conversion value. As an

alternative method, if the interrupts are enabled and the stack is not full, the program can wait for

an A/D interrupt to occur.

Note: When checking for the end of the conversion process, if the method of polling the EOCB bit

in the ADCR0 register is used, the interrupt enable step above can be omitted.

The accompanying diagram shows graphically the various stages involved in an analog to digital

conversion process and its associated timing.

The setting up and operation of the A/D converter function is fully under the control of the

application program as there are no configuration options associated with the A/D converter. After an

A/D conversion process has been initiated by the application program, the microcontroller internal

hardware will begin to carry out the conversion, during which time the program can continue with

other functions. The time taken for the A/D conversion is 16tAD where tAD is equal to the A/D clock

period.

t AD C

A/ D c onv er si on ti me

0000B

xxx B

xxxxB - A CE [ 3: 0] i s not e q ual t o "0 "

010B

ST AR T

EO CB

AC E3 ~

AC E0

A CS 4,

AC S1 ~A CS 0

Po we r- on

Re se t

En d of A /D

co nv er si on

1: D ef i ne po rt c on fi gu ra ti on

2: S el ec t anal og c hannel

t A DCS =4 t AD

t AD C = 16 t AD

No te :

St ar t of A /D

co nv er si on

Re se t A/ D

co nv er te r

A/ D sa mp li ng ti me

t A DCS

000B

St ar t of A /D

co nv er si on

Re se t A/ D

co nv er te r

001B

St ar t o f A/ D

co nv er si on

Re se t A/ D

co nv er te r

En d of A /D

co nv er si on

A/ D sa mp li ng ti me

t A DCS

AD C mo du le

AD OF F

of f

t ON 2S T

t AD C

A/ D c onv er si on ti me

A/D Conversion Timing

Note: tADCS=4tAD

tADC=16tAD

HT46R017 Datasheet(PDF) 59 Page - Holtek Semiconductor Inc

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