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User Guide V0.90
ISP Header (Target System)
GEMINI-1 - Target System Connection
Details
The programmer 10-way ribbon cable supplied is
terminated with a standard 10-way 0.1" pitch IDC plug.
This is designed to mate with the complimentary male
10-way IDC header on the target system. The pin-out of
the header is shown opposite:
ISP Pin Assignments
Pin GEMINI-1
Target Microcontroller Description
Pin Name
Pin Name
1
PROG_Vcc
Vcc
2
PROG_Vpp
EA/Vpp
3
PROG_PSEN
PSEN
4
PROG_TXD
RXD
5
PROG_ACTIVE LED or Interrupt pin
6
PROG_RXD
TXD
7
PROG_GND
Vss
8
N/C
-
9
PROG_GND
Vss
10 PROG_RESET
RESET
Y
= This connection must be made
N/C = No Connect
Connector recommendations
The IDC connector supplied with the GEMINI-1 programmer is 'bump' polarised so that it
can not be inserted the wrong way around in a polarised socket. If the connector used on
the target system is not polarised, it is advised that measures are taken to prevent the
connector being plugged in the wrong way around. This could be achieved by removing pin
Note: This is the view of the connector fitted to the target
board, as seen from above (the component side).
Target Vcc connection
Target Vpp pin - Vpp is applied to this pin (if required)
Driven LOW by programmer to enter 'Boot Loader' mode
Programmer Transmit line
Programmer Active LED/Interrupt pin
Programmer Receive line
Target GROUND (Vss) connection
-
Target GROUND (Vss) connection
Target RESET control pin
x
= Optional
MCU = ??????????????????
8 (a second ground) from the target header and placing a
blanking piece of plastic in pin 8 of the cable header.
19
10-Way IDC Header
Top Pin View
1
2
PROG_Vcc
PROG_VPP
3
4
PROG_PSEN
5
6
PROG_ACTIVE
PROG_RXD
7
8
PROG_GND
9
10
PROG_GND
PROG_RESET
PROG_TXD
N/C
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