ST626XCKITEU STMicroelectronics, ST626XCKITEU Datasheet - Page 16

• Manufacturer Part Number: ST626XCKITEU
• Manufacturer: STMicroelectronics

Specifications of ST626XCKITEU

• Lead Free Status / Rohs Status: Supplier Unconfirmed

20
The Starter Kit Hardware
The following diagram shows the RS-232 connections and line allocations:
TX, RX, CTS and RTS are defined so that the board is used as a slave. To use the board as
a master, swap both the RX and TX and the CTS and RTS pin connections on the cable.
2.12 Demonstration Selector Jumpers
The demonstration selector is made up of 6 jumpers W26 to W31 (marked 13 on the Starter
Kit board diagram on page 11), with each jumper connected to a resistor. Each resistor gen-
erates a different voltage.
After reset, the voltage value generated by the resistor whose jumper is installed is sent to
PA3 on the ST6265. PA3 is programmed as an A/D converter. The program installed on the
ST6265 uses the input from PA3 to select the appropriate demo. The following table lists the
voltage values generated by each resistor:
The same principle can be used for keyboard decoding. For a complete example of this, refer
to the SGS-Thomson application note: “AN431: Using ST6 Analog Inputs for Multiple Key De-
coding”.
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Resistor value:
R14: 10 K
R15: 680
R16: 750
R17: 820
R19: 1 K
R20: 1.2 K
+12V
SUBD - 9 POINTS
CONNECTOR
10K
Theoretical voltage value:
No JUMPER: 5 V
JUMPER-D1: 0 V
JUMPER-D2: 333 mV
JUMPER-D3: 666 mV
JUMPER-D4: 999 mV
JUMPER-D5: 1.332 V
6
7
8
9
1
2
3
4
5
TX
CTS
RX
RTS
BUFFER
RS232
LINE
W19
W21
W17
W20
ST6265
PC0
PC2
PC1
PC3