HT68F13 datasheet(21/161 Pages) HOLTEK

21 / 161 page

InCircuitProgramming

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 using a 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.

The Holtek Flash MCU to Writer Programming Pin correspondence table is as follows:

Holtek Writer

Devices

PinDescription

PinName

SDATA

PA0

SerialAddressanddata -- read/write

SCLK

PA2

Addressanddataserialclockinput

VPP

RES

Resetinput

VDD

PowerSupply(5.0V)

VSS

Ground

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 addi-

tional lines are required for the power supply and one line for the reset. The technical details regard-

ing the in-circuit programming of the devices are beyond the scope of this document and will be

suppliedinsupplementaryliterature.

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.

HT68F13/HT68F14/HT68F15

EnhancedI/OFlashType MCU

Rev.1.10

February9,2011

V D D

V P P

S D A T A

S C L K

V S S

T o o t h e r C i r c u i t

P A 0

P A 2

V S S

R E S

V D D

W r i t e r C o n n e c t o r

S i g n a l s

M C U P r o g r a m m i n g

P i n s

Note:

* may be resistor or capacitor. The resistance of * must be greater than 1k

W or the capacitance

of*mustbelessthan1nF.

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