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Holtek 8051 e-Link Driver for Keil μVision User Manual
8-Bit 8051 Se�ies
Holtek 8051 e-Link Driver Instructions and Installation
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HT8051OCDS e-Link Pin Definitions
Name
Description
Direction
VDD
When the e-Link is used to supply power, the power is provided on
this output pin.
e-Link→
When using an external power supply, this is the e-Link input power
pin.
e-Link←
�CDSCK
OCDS CLK signal during simulation
e-Link→
�CDSDA
OCDS Data signal during simulation
e-Link ↔
GND
e-Link Ground pin
e-Link ↔
Rese�ved
e-Link reserved pins
Unknown
▀
VDD, OCDSCK, OCDSDA, GND are the necessary HT8051OCDS-ICE pins. Even if power is
supplied from the target board, VDD must be the same as it is used as the e-Link output voltage
reference
●
Note that the e-Link reserved pins are not NC pins. Their voltages are at an unknown level
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HT8051OCDS-ICE Hardware Connection Figure
Connect to PC
e-Link
OCDS EV
e-Cable1225A
