HT66F016 datasheet(20/116 Pages) HOLTEK

20 / 116 page

HT66F016/HT66F017/HT68F016/HT68F017

Rev. 1.00

May 14, 2012

· 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

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.

Holtek

Writer Pins

MCU

Programming Pins

Description

ICPMS

PA7

Programming

Mode Select

ICPDA

PA0

Programming

Serial Data

ICPCK

PA2

Programming

Clock

VDD

Power Supply

VSS

Ground

Programmer and MCU Pins

The Program Memory can 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 additional lines are required for

the power supply and one line for the reset. The techni-

cal details regarding the in-circuit programming of the

devices are beyond the scope of this document and will

be supplied in supplementary literature.

During the programming process the ICPMS 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

HT66F016 Datasheet(PDF) 20 Page - Holtek Semiconductor Inc

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