Illegal Gray/Binary Code Events; Up/Down Count Events - Analog Devices ADSP-BF506F Hardware Reference Manual

Adsp-bf50x blackfin processor

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Functional Description

acknowledged, the application software is responsible for correct interpre-

tation of the events. It is recommended to logically

rupt requests are cleared by write-one-to-clear (W1C) operations to the

unless the counter module is disabled.

Illegal Gray/Binary Code Events

When the illegal transitions described in

"Binary Encoder Mode" on page 13-5

in the quadrature encoder or binary encoder modes.

been incremented. Similarly, the

events are independent. For instance, if the counter first increments by

one and then decrements by two, both bits remain set, even though the

resulting counter value shows a decrement by one. In up/down counter

mode, hardware may detect simultaneous active edges on the

inputs. In that case, the

Interrupt requests for these events may be enabled through the

bits. This feature should be used carefully when the counter is

clocked at high rates. This is especially critical when the counter operates

mode, as interrupts would be generated every

These events can also be used for additional push buttons, if GP counter

features are not needed. When up/down counter mode is enabled, these

count events can be used to report interrupts from push buttons that con-

registers to identify pending interrupts. Inter-

bits are set.

ADSP-BF50x Blackfin Processor Hardware Reference

"Quadrature Encoder Mode" on

bit reports decrements. The two

remains unchanged, but both the

the content of the

bit should only be set

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