User`s manual

78 RabbitCore RCM3000
F.2 Header J6
The connector is a 2 × 5, 0.1" pitch header suitable for connecting to a IDC receptacle,
with the following pin allocations.
All Parallel Port F lines (pins 1 to 8) are pulled up internally to +3.3 V via 100 kΩ resis-
tors. When used as outputs, the port pins will sink up to 6 mA at a V
OL
of 0.4 V max.
(0.2 V typ), and source up to 6 mA at a V
OH
of 2.2 V typ. When used as inputs, all pins
are 5 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).
Table F-1. RCM3000/RCM3100 Prototyping Board Header J6 Pinout
Pin Rabbit 3000 Primary Function Alternate Function 1 Alternate Function 2
1 Parallel Port F, bit 0 General-purpose I/O port
Quadrature decoder 1 Q
input
SCLK_D
2 Parallel Port F, bit 1 General-purpose I/O port
Quadrature decoder 1 I
input
SCLK_C
3 Parallel Port F, bit 2 General-purpose I/O port
Quadrature decoder 2 Q
input
-
4 Parallel Port F, bit 3 General-purpose I/O port
Quadrature decoder 2 I
input
-
5 Parallel Port F, bit 4 General-purpose I/O port PWM[0] output
Quadrature decoder 1 Q
input
6 Parallel Port F, bit 5 General-purpose I/O port PWM[1] output
Quadrature decoder 1 I
input
7 Parallel Port F, bit 6 General-purpose I/O port PWM[2] output
Quadrature decoder 2 Q
input
8 Parallel Port F, bit 7 General-purpose I/O port PWM[3] output
Quadrature decoder 2 I
input
9 +5 V External buffer logic supply
10 0 V Common