668-0010 Rabbit Semiconductor, 668-0010 Datasheet - Page 188
668-0010
Manufacturer Part Number
668-0010
Description
IC MPU RABIT3000 55.5MHZ 128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0010
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Features
-
Other names
316-1016
- Current page: 188 of 312
- Download datasheet (2Mb)
The Quadrature Decoders are clocked by the output of Timer A10, giving a maximum
clock rate from perclk/2 down to perclk/512. 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 filter
that rejects pulses shorter than two clock period wide. In addition, the clock rate must be
high enough that transitions on the I and Q inputs are sampled in different clock cycles.
Input capture 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.
The Quadrature Decoder generates an interrupt when the counter increments from 0xFF
(0x3FF in 10-bit mode) to 0x00, or when the counter decrements from 0x00 to 0xFF
(0x3FF in 10-bit mode). The timing for the interrupt is shown below. Note that the status
bits in the QDCSR are set coincident with the interrupt, and the interrupt and status bits
are cleared by reading the QDCSR.
178
Rabbit 3000 Microprocessor User’s Manual
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