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Development Tool
Holtek Semiconductor USA Inc. 19 Hammond Suite 513 Irvine CA 92618 USA 949-273-8988
Copyright 2017. Holtek Semiconductor USA Inc. All Rights Reserved.
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To develop Holtek’s 8bit MCU is easy and inexpensive. For our latest generation MCU, you simply need:

a. IDE3000: Integrated development Environment software for all series of Holtek MCU.
b. e-link and OCDS chip
OCDS (On Chip Debugger System) chip:
These chips are the same as Flash MCU except they have internal debugger circuit to connect with e-Link. OCDS
chips have the same pin assignment as the Flash MCU. Please look at Flash MCU datasheet for the part number
and pin assignment. You usually need only 2~3 Pcs of these chips for emulation.

Ex: HT66V0185 is the OCDS chip for HT66F0185.
Optional purchase:
1. e-FADPXX. If your target device is a 8pin or 10pin, MCU, the OCDS only comes at 16pin minimum.  
It is highly recommended to use this flexible PCB transform a 16pin package type into a 8pin or 10 pin
package type.
2. Your target board for Holtek’s OCDS chip to mount on. For those LQFP package projects,
we recommend you to purchase a LQFP adapter in the market in order to connect the OCDS chip to
your target board.
Once the development is finished, if you need to program a few Flash MCU, there are two options:

1. It is always a good choice to utilize your e-link as a tool to write your code into a real Flash MCU by ICP
(In Circuit Programming).
ICP Manual
2. If you need to program a few hundred Flash MCU chips, an e-writer Pro and an e-socket are highly recommended.
More Information
If you can not find OCDS chip for the Flash MCU, probably they use different tool.Find out More
To order above tools from Holtek USA.Online Order