Holtek HT45R36 Manuale di riferimento

Touch Switch Detection Tool Demo Board Introduction

Touch Switch Detection Tool Demo

Board Introduction

D/N: HA0145E

Introduction

When using Holtek touch switch series devices, such as the HT45R34, HT45R36,

HT45R38 etc, it is normally necessary to know the touch switch sense value changes in

order to adjust the switch sensitivity. In order to allow users, after programming their

devices, to conveniently monitor the touch switch value changes, Holtek has designed

this demoboard.

The main function of this demoboard is to display user transmitted data. To allow for easy

communication, a communication program is also provided with the demoboard.

The demoboard uses the HT48R10A-1 device. The HT48R10A-1 is a Holtek 8-bit MCU

with 1K Program Memory capacity, 64 byte Data Memory capacity and 21 I/O lines.

Touch Switch Detection Tool Demo Board Introduction

Demo Board Hardware Block Diagram

Block Diagram

Hardware Functional Description

•Main Controller HT48R10A-1

•Main controller is a SLAVE terminal which receives serial data to display from a

MASTER terminal

•Three switches are used to setup the working mode and to switch the display

information

•The display has two sections. One section is formed from four segments and is used to

display the data obtained on the serially.

Touch Switch Detection Tool Demo Board Introduction

Circuit Description

Circuit Diagram

Touch Switch Detection Tool Demo Board Introduction

Circuit Description

•P1 is the input 9V DC power source and which after filtering by C6 and C2 is provided

to the 7805 regulator pin 1. The pin 3 output of the regulator provides the 5V supply for

the MCU. The MCU power can also be directly provided on V1 and V2. Another way is

to provide the power via PIN1 and PIN5 on H2. Any one of the three methods of

supplying power can be chosen.

•C1, C3, C4, R1 and R2 form the MCU reset circuit.

•D1 is the four digit display which is used to display the data received on the serial port.

DS0~DS3 are LEDS which are used to display the corresponding RC channel in HEX

format.

•S1, S2 and S3 are the ADD, DEC and MODE switches and are used to setup the

channel and operating modes.

•H2 is the serial communication interface. This application uses the CS, CLK and DATA

three line communication method. Among these PC0 corresponds to CS, PC1

corresponds to CLK and PC2 corresponds to DATA. The data is read on the falling

edge of the CLK signal.

Note: when the MCU power supply is provided on P1 as a 9V DC supply, or by using the

V1 and V2 direct MCU supply, PIN1 on H2 does not have to be connected.

Communication Protocol Description

Serial Communication Protocol Description

This application uses a three wire protocol for communication. The HT48R10A-1 is a

SLAVE terminal whose communication method is as follows:

•The data total length is 24-bits among which the display data is 16-bits and the display

channel is 8-bits.

•Data transmission is to first transmit the 16-bit data for display, then transmit the 8-bit

channel display information. The transmission method is LSB first.

•When displaying the 8-bit channel, only the lowest four bits are used, the highest four

bits are required to be the same as the lower four bits and are used to determine if the

display data has been received correctly.

•The data must be ready on the falling edge of the CLK signal.

Touch Switch Detection Tool Demo Board Introduction

Communication Timing Diagram

In the above diagram the time between A and B must not be less than 25us and the

communication speed must be less than 100kHz.

Using the Master Transmission Program

The main function of the Demo Board is to display the data transmitted by the user. In

order to facilitate easy data transfer, a communication program is provided for the Master.

The Master program description is as follows:

Communication Port Definition

When using the Master Transmission program, three I/O lines are necessary, P_CS (chip

select), P_CLK (clock) and P_DATA (data). These three lines can be defined as any I/O

pins.

Data Input

When calling the Master Transmission program, it is necessary to place the data to be

transmitted in three Data Memory locations. These three Data Memory locations are

described below:

•M_DEBUG_DATAL: during serial communication this is the 8-lower bits of the 16-bit

display data. Before calling this function the data must be properly setup.

•M_DEBUG_DATAH: during serial communication this is the 8-higher bits of the 16-bit

display data. Before calling this function the data must be properly setup.

•M_DEBUG_ADDR: during serial communication this is the corresponding data

address. Only the lowest four bits are effective, the highest four bits should have the

same value and are use to verify that the displayed channel data has been correctly

received.

Touch Switch Detection Tool Demo Board Introduction

For example, to transmit channel 1 data, then a value of 11H should be placed in

M_DEBUG_ADDR. To transmit channel 5 data, then 55H should be placed in

M_DEBUG_ADDR.

Call Method

When using it is only necessary to place the SBR_DEBUG subroutine into the main

program.

Note that before calling setup the M_DEBUG_DATAL, M_DEBUG_DATAH and

M_DEBUG_ADDR values.

The transmission program is as follows:

;;-----------------------------------------------

;; Function : SBR_DEBUG

;; In : M_DEBUG_DATAL,M_DEBUG_DATAH,M_DEBUG_ADDR

;; Out : NULL

;; Description: Send M_DEBUG_DATAL & M_DEBUG_DATAL & ASCR to Slave

by SPI

;; Format : LSB bit0~bit15 bit16~bit23

;; Data must ready before falling

;;-----------------------------------------------

SBR_DEBUG:

CLR P_CS ;;CS = 0

MOV A,20

SDZ ACC

JMP $-1 ;;Wait

MOV A,8 ;;Load length

L_DEBUG_LP1:

RRC M_DEBUG_DATAL ;;Send M_DEBUG_DATAL

CLR P_DATA

SZ C

SET P_DATA

JMP $+1

CLR P_CLK ;;CLK = 0,Slave will read data

JMP $+1

SET P_CLK

Touch Switch Detection Tool Demo Board Introduction

SDZ ACC

JMP L_DEBUG_LP1

MOV A,8

L_DEBUG_LP2:

RRC M_DEBUG_DATAH ;;Send M_DEBUG_DATAH

CLR P_DATA

SZ C

SET P_DATA

JMP $+1

CLR P_CLK ;;CLK = 0,Slave will read data

JMP $+1

SET P_CLK

SDZ ACC

JMP L_DEBUG_LP2

MOV A,8

L_DEBUG_LP3:

RRC M_DEBUG_ADDR ;;Send ASCR

CLR P_DATA

SZ C

SET P_DATA

JMP $+1

CLR P_CLK ;;CLK = 0,Slave will read data

JMP $+1

SET P_CLK

SDZ ACC

JMP L_DEBUG_LP3

SET P_CS

RET

Touch Switch Detection Tool Demo Board Introduction

Demo Board Operating Description

Power Connection Method

There are two methods of supplying power to the Demo Board. One way is to use a 9V

DC adapter which will be regulated down to 5V via the onboard 7805 regulator IC.

Another way is to supply the 5V power directly to the VCC and GND interface.

Display Description

As shown in the above diagram, the display illustrates numerical data. The LED are used

to display the corresponding channel for the data.

Switch Functional Description

MODE switch: automatic mode and manual mode select key. In the automatic mode the

display channel will be switched at 5 second intervals. In the manual mode the ADD and

DEC switches are used to change the display channel.

•ADD switch/DEC switch

in the manual mode these keys change the displayed channel number.

Data Display

Display Channel

DC 9V Power Input

Series communication

Interface

DC 5V Power

VCC and GND

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