Updated pin layout: incl ICSP pins for Uno and note on SDA/SS for PCD

README.rst

@@ -15,26 +15,27 @@ Pin Layout
 
 The following table shows the typical pin layout used:
 
-+-----------+---------+-----------------------------+
++-----------+----------+---------------------------------+
 |           | PCD      | Arduino                         |
-|           +---------+---------+---------+---------+
+|           +----------+-------------+---------+---------+
 |           | MFRC522  | Uno         | Mega    | Nano v3 |
-+-----------+---------+---------+---------+---------+
++-----------+----------+-------------+---------+---------+
 | Signal    | Pin      | Pin         | Pin     | Pin     |
-+===========+=========+=========+=========+=========+
++===========+==========+=============+=========+=========+
 | RST/Reset | RST      | 9 [1]_      | 5 [1]_  | D9      |
-+-----------+---------+---------+---------+---------+
++-----------+----------+-------------+---------+---------+
-| SPI SS    | SDA     | 10 [2]_ | 53 [2]_ | D10     |
+| SPI SS    | SDA [3]_ | 10 [2]_     | 53 [2]_ | D10     |
-+-----------+---------+---------+---------+---------+
++-----------+----------+-------------+---------+---------+
-| SPI MOSI  | MOSI    | 11      | 52      | D11     |
+| SPI MOSI  | MOSI     | 11 / ICSP-4 | 52      | D11     |
-+-----------+---------+---------+---------+---------+
++-----------+----------+-------------+---------+---------+
-| SPI MISO  | MISO    | 12      | 51      | D12     |
+| SPI MISO  | MISO     | 12 / ICSP-1 | 51      | D12     |
-+-----------+---------+---------+---------+---------+
++-----------+----------+-------------+---------+---------+
-| SPI SCK   | SCK     | 13      | 50      | D13     |
+| SPI SCK   | SCK      | 13 / ICSP-3 | 50      | D13     |
-+-----------+---------+---------+---------+---------+
++-----------+----------+-------------+---------+---------+
 
-.. [1] Configurable, typically defined as RST_PIN in Sketch.
+.. [1] Configurable, typically defined as RST_PIN in sketch/program.
-.. [2] Configurable, typically defined as SS_PIN in Sketch.
+.. [2] Configurable, typically defined as SS_PIN in sketch/program.
+.. [3] The SDA pin might be labeled SS on some/older MFRC522 boards. 
 
 
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