Z-World RabbitCore RCM3200 User Manual - page 78
74
RabbitCore RCM3200
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 k
Ω
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. 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