HT68F03 datasheet(17/139 Pages) HOLTEK

17 / 139 page

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.00

April 16, 2010

In Circuit Programming

The provision of Flash type Program Memory provides

the user with a means of convenient and easy upgrades

and modifications to their programs on the same device.

As an additional convenience, Holtek has provided a

means of programming the microcontroller in-circuit us-

ing a 5-pin interface. This provides manufacturers with

the possibility of manufacturing their circuit boards com-

plete with a programmed or un-programmed

microcontroller, and then programming or upgrading the

program at a later stage. This enables product manufac-

turers to easily keep their manufactured products sup-

plied with the latest program releases without removal

and re-insertion of the device.

MCU Programming Pins

Function

PA0

Serial Data Input/Output

PA2

Serial Clock

RES

Device Reset

VDD

Power Supply

VSS

Ground

The Program Memory and EEPROM data memory can

both be programmed serially in-circuit using this 5-wire

interface. Data is downloaded and uploaded serially on

a single pin with an additional line for the clock. Two ad-

ditional lines are required for the power supply and one

line for the reset. The technical details regarding the

in-circuit programming of the devices are beyond the

scope of this document and will be supplied in supple-

mentary literature.

During the programming process the RES pin will be

held low by the programmer disabling the normal opera-

tion of the microcontroller and taking control of the PA0

and PA2 I/O pins for data and clock programming pur-

poses. The user must there take care to ensure that no

other outputs are connected to these two pins.

· Table Read Program Example

tempreg1 db

; temporary register #1

tempreg2 db

; temporary register #2

mov a,06h

; initialise low table pointer - note that this address

mov tblp,a

; is referenced

mov a,07h

; initialise high table pointer

tbhp,a

tabrd tempreg1

; transfers value in table referenced by table pointer data at program

; memory address

²706H² transferred to tempreg1 and TBLH

dec tblp

; reduce value of table pointer by one

tabrd tempreg2

; transfers value in table referenced by table pointer data at program

; memory address

²705H² transferred to tempreg2 and TBLH in this

; example the data

²1AH² is transferred to tempreg1 and data ²0FH² to

; register tempreg2

org 700h

; sets initial address of program memory

dc 00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh

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