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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
HT8051OCDS-ICE Usage Restrictions
▀
OCDSDA / OCDSCK are pin-shared with other functions
1. When the e-Link is enabled, the other OCDSDA/OCDSCK shared pin function will be
invalid.
2. When the e-Link is disabled, the other OCDSDA/OCDSCK shared pin functions are normal.
▀
The OCDSDA/OCDSCK cable cannot be connected to a capacitor. When it is pin-shared with
the reset pin, the Reset circuit should be as follows:
1N4148*
10kΩ~
100kΩ
VDD
OCDSCK must
connect to this point
VSS
PB0/RES
V
DD
300Ω*
0.1~1uF
0.01uF**
▀
When the OCDSDA is pin-shared with an I/O pin powered by the e-Link, the 6.8KΩ pull high
resistor connected to the OCDSDA pin will influence the I/O voltage value. This should be taken
into account when designing the I/O circuits.
▀
HT8051OCDS-ICE Keys and Indicators
●
Keys:
Used to reset the HT8051OCDS-ICE.
●
Indicator LEDs
Status: The yellow LED is used to indicate if the e-Link supplies power to the target board.
On: Supplying power to the target board
Off: Not supplying power to the target board
Error: The red LED is used to indicate whether the e-Link is operating incorrectly.
On: Error has occurred
Off: Operating normally
Active: The blue LED is used to indicate the e-Link activity level.
Quick flashing: Busy
Off: Waiting
