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3.4 Equinox 10-way Header (UART Boot Loader)
This connection method is suitable for interfacing the ISPJUNO programmer to a Target System
which features the following:
•
Equinox 10-way IDC ISP Header
•
An Atmel Wireless T89C51Rx2 / CC01 microcontroller
•
A Philips P89C51Rx2 or P89C66x microcontroller
•
The relevant connections for in-system programming via the Boot Loader.
To implement this connection, simply plug the 10-way ISP cable into the Programmer J6 header and
plug the other end of the cable into the matching header on the Target System.
Please note:
The programmer interfaces to the Target System at TTL voltage levels. If the serial port to your Target
System is RS-232, you will need to convert the TTL levels from the programmer to RS-232 using an
external convertor.
Pin
Programmer
No
Pin name
1
PROG_VCC
2
N/C
3
PROG_PSEN
4
PROG_TXD
5
N/C
6
PROG_RXD
ISPJUNO - Portable ISP Programmer - User Guide V0.84 – 17/04/20
Figure 3.4 – Equinox 10-way IDC Header (J8) viewed from above
Warning!
1. It is possible for +12V to be output on pin 10 of this
2. Connecting to the wrong ISP Header may cause
Programmer
Connect to
Input / Output
pin on
Target Device
P
TARGET_VCC Target Vcc
-
N/C
O
PSEN
O
RXD
-
N/C
I
TXD
connector when programming ATtiny11/12/15
devices.
catastrophic damage to the Programmer & Target
System
Description
This pin should be connected to the Target
System Vcc. This voltage could be used to
power the programmer depending on the
settings of the power switch/jumper on the
programmer.
Not connected
PSEN pin
This pin is driven LOW by the programmer
to enter 'Boot Loader' programming mode.
Programmer RXD (Transmit) pin
The programmer transmits serial data on
this pin to the Target Device RXD
(Receive) pin.
Not Connected
Programmer RXD (Transmit) pin
55
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