Header J6 - Rabbit RCM3000 User Manual

E.2 Header J6
The connector is a 2 × 5, 0.1" pitch header suitable for connecting to an IDC receptacle
with the following pin allocations.
Pin
1 Parallel Port F, bit 0
2 Parallel Port F, bit 1
3 Parallel Port F, bit 2
4 Parallel Port F, bit 3
5 Parallel Port F, bit 4
6 Parallel Port F, bit 5
7 Parallel Port F, bit 6
8 Parallel Port F, bit 7
9 +5 V
10 0 V
All eight Parallel Port F lines are pulled up internally to +3.3 V via 100 kΩ resistors.
When used as outputs, the port pins will sink up to 6 mA at a V
typ), and source up to 6 mA at a V
tolerant.
As the outputs from Parallel Port F are compatible with 3.3 V logic, buffers may be
needed when the external circuit drive requirements exceed the 2.2 V typ logic high and/or
the 6 mA maximum from the Rabbit 3000. The +5 V supply output is provided for supply-
ing interface logic. When used as inputs, the pins on header J6 do not require buffers
unless the input voltage will exceed the 5 V tolerance of the processor pins. Usually, a
simple resistive divider with catching diodes will suffice if higher voltage inputs are
required. If the outputs are configured for open-drain operation, they may be pulled up to
+5 V (while observing the maximum current, of course).
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Table E-1. RCM30/31/32XX Prototyping Board Header J6 Pinout
Rabbit 3000 Primary Function
General-purpose I/O port
General-purpose I/O port
General-purpose I/O port
General-purpose I/O port
General-purpose I/O port PWM[0] output
General-purpose I/O port PWM[1] output
General-purpose I/O port PWM[2] output
General-purpose I/O port PWM[3] output
External buffer logic supply
Common
Alternate Function 1 Alternate Function 2
Quadrature decoder 1 Q
input
Quadrature decoder 1 I
input
Quadrature decoder 2 Q
input
Quadrature decoder 2 I
input
of 2.2 V typ. When used as inputs, all pins are 5 V
OH
SCLK_D
SCLK_C
-
-
Quadrature decoder 1 Q
input
Quadrature decoder 1 I
input
Quadrature decoder 2 Q
input
Quadrature decoder 2 I
input
of 0.4 V max. (0.2 V
OL
RabbitCore RCM3000