HT46R017 datasheet(53/91 Pages) HOLTEK

53 / 91 page

Rev. 1.00

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HT46R016/HT46R017

Enhanced A/D 8-Bit OTP MCU

PWM Programming Example

The following sample program shows how the PWM output is setup and controlled.

mov a,64h

; setup PWM value of decimal 100

mov pwm,a

set ctrl0.1

; select the 7+1 PWM mode

set ctrl0.0

; select pin PA4 to have a PWM function

clr pac.4

; setup pin PA4 as an output

set pa.4

; enable the PWM output

clr pa.4

; disable the PWM output_ pin PA4 forced low

Analog to Digital Converter

The need to interface to real world analog signals is a common requirement for many electronic

systems. However, to properly process these signals by a microcontroller, they must first be

converted into digital signals by A/D converters. By integrating the A/D conversion electronic

circuitry into the microcontroller, the need for external components is reduced significantly with the

corresponding follow-on benefits of lower costs and reduced component space requirements.

A/D Overview

The device contains a 4-channel analog to digital converter which can directly interface to external

analog signals, such as that from sensors or other control signals and convert these signals directly

into either a 12-bit digital value.

Part No.

Input Channels

Conversion Bits

Input Pins

HT4�R01�/017

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PA0~PA3

The accompanying block diagram shows the overall internal structure of the A/D converter, together

with its associated registers.

A/ D Co nv er te r

PB0 /A N0

PB1 /A N1

PB2 /A N2

PB3 /A N3

A/ D Re fe re nc e Vo lt ag e

A DRL

AD RH

A/ D Da ta

Re gi st er s

VBG EN

S TA RT EO CB AD OF F

V S S

PB 0/ VR EF

A DCK 2~ A DCK 0

f SYS

AC E3 ~A CE 0

A CS 4,

AC S 1~ AC S 0

1. 25V

A/ D Cl oc k

V DD

AD OF F

Bi t

VR EF S B it

AD RF S b it

¸ 2 N

(N =0 ~6 )

A/D Converter Structure

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