HT67F60 datasheet(36/242 Pages) HOLTEK

36 / 242 page

Rev. 1.50

March 06 , 2012

Rev. 1.50

March 06 , 2012

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPRO

5-pin interface. This provides manufacturers with the possibility of manufacturing their circuit

boards complete with a programmed or un-programmed microcontroller, and then programming or

upgrading the program at a later stage. This enables product manufacturers to easily keep their

manufactured products supplied 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 additional 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 supplementary literature.

During the programming process the RES pin will be held low by the programmer disabling the

normal operation of the microcontroller and taking control of the PA0 and PA2 I/O pins for data and

clock programming purposes. The user must there take care to ensure that no other outputs are

connected to these two pins.

Table Read Program Example

tempreg1

; temporary register #1

tempreg2

; 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 706H 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 705H transferred to tempreg2 and

TBLH in this

; example the data 1AH is transferred to tempreg1

and data 0FH to

; register tempreg2

org 700h

; sets initial address of program memory

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

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