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Quadrature Encoder 750-631
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It is possible to process and/or check the below listed actions via the control and status
bits.
Extending the 16 bit counting range: The internal counting range is 16 bits or a
maximum value of 65535. Should the application require an extended count range the
location-difference-integration method may be employed. This method uses the control
system to store the interrogated counter value. Any new interrogated value will have the
previously stored counter value subtracted from it. This value will then be added to an
accumulated register value. It is assumed that the counter difference of the two
interrogated values is smaller than 16 bits therefore overflows need not be considered.
Another method calculates the extended counter range via the underflow and overflow
status bits. The interrogated value is either added or subtracted to the accumulation
register depending upon the status of the overflow or underflow bits.
Set Counter Position: The presetting of the counter is possible via the CNT_SET bit.
The desired preset is loaded into the data register and the CNT_SET bit is set from 0 to
1. The CNTSET_ACC bit will be set to 1 when the preset value is loaded into the count
register.
Maintaining the Present Counter Position: The counter present value may be
maintained or latched via the external Latch input. First the external latch must be
enabled via the EN_LATEXT bit. Once the input is enabled, the data will be latched
into the counter module upon a 0 to 1 transition. Upon completion of the latch process
the external latch valid bit LATEXT_VAL will be set to 1.
Maintaining a Reference Point: The storage of a present counter value may also
accomplished via the Index pulse from the encoder. First the index latch enable bit must
be set, EN_LACT, to a value 1. The counter present value will be latched upon the low
to high transition of the Index input. Upon completion of the data latch process the
Index Latch Valid bit, LACT_VAL will be set to 1.