101-0517 Rabbit Semiconductor, 101-0517 Datasheet - Page 102

• Manufacturer Part Number: 101-0517
• Description: MODULE RABBITCORE RCM3100
• Manufacturer: Rabbit Semiconductor

Specifications of 101-0517

• Rohs Status: RoHS non-compliant
• Module/board Type: MPU Core Module
• For Use With/related Products: RCM3100
• Other names: 316-1021

E.6 Quadrature Decoder
The two-channel Quadrature Decoder accepts inputs via Parallel Port F from two external
optical incremental encoder modules. Each channel of the Quadrature Decoder accepts an
in-phase (I) and a quadrature-phase (Q) signal, and provides 8-bit counters to track shaft
rotation and provide interrupts when the count goes through the zero count in either direc-
tion. The Quadrature Decoder contains digital filters on the inputs to prevent false counts
and is clocked by the output of Timer A10. Each Quadrature Decoder channel accepts
inputs from either the upper nibble or lower nibble of Parallel Port F. The I signal is input
on an odd-numbered port bit, while the Q signal is input on an even-numbered port bit.
There is also a disable selection, which is guaranteed not to generate a count increment or
decrement on either entering or exiting the disable state. The operation of the counter as a
function of the I and Q inputs is shown below.
The Quadrature Decoders are clocked by the output of Timer A10, giving a maximum
clock rate of one-half of the peripheral clock rate. The time constant of Timer A10 must be
fast enough to sample the inputs properly. Both the I and Q inputs go through a digital fil-
ter that rejects pulses shorter than two clock periods wide. In addition, the clock rate must
be high enough that transitions on the I and Q inputs are sampled in different clock cycles.
The Input Capture (see the Rabbit 3000 Microprocessor Users Manual) may be used to
measure the pulse width on the I inputs because they come from the odd-numbered port
bits. The operation of the digital filter is shown below.
96
Peri Clock
Timer A10
Rejected
Accepted
Figure E-2. Operation of Quadrature Decoder Counter
RabbitCore RCM3100