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LS7766 Folha de dados(PDF) 4 Page - LSI Computer Systems

Nome de Peças LS7766
Descrição Electrónicos  32-BIT SINGLE- AXIS/DUAL-AXIS QUADRATURE COUNTER
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Fabricante Electrônico  LSI [LSI Computer Systems]
Página de início  http://www.lsicsi.com
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MCR0 : The MCR0 is an 8-bit read/write register which configures the counting modes and the index input functionality.
Upon power-up, the MCR0 is cleared to zero.
MCR0: B7 B6 B5 B4 B3 B2 B1 B0
B1B0 = 00: Non-quadrature count mode (A = clock, B = direction).
= 01: x1 quadrature count mode (one count per quadrature cycle).
= 10: x2 quadrature count mode (two counts per quadrature cycle).
= 11: x4 quadrature count mode (four counts per quadrature cycle).
B3B2 = 00:
Free-running count mode.
= 01:
Single-cycle count mode (CNTR disabled with carry and borrow, re-enabled with reset or load)
= 10:
Range-limit count mode (up and down count ranges are limited between IDR and zero, respectively.
Counting freezes at these limits but resumes when the direction is reversed)
= 11:
Modulo-n count mode (input count clock frequency is divided by a factor of [n+1], where n = IDR.
In up direction, the CNTR is
cleared to 0 at CNTR = IDR and up count continues.
In down direction, the CNTR is
preset to the value of IDR at CNTR = 0 and down count continues.
A mod-n rollover marker pulse is generated at each limit at the FLGa output).
B5B4 = 00: Disable INDX/ input.
= 01: Configure INDX/ input as the load_CNTR input (transfers IDR to CNTR).
= 10: Configure INDX/ as the reset _CNTR input (clears CNTR to 0).
= 11: Configure INDX/ as the load_ODR input (transfers CNTR to ODR).
B6 = 0: Asynchronous index.
= 1: Synchronous index (overridden in non-quadrature mode).
B7 = 0: Input filter clock (PCK) division factor = 1. Filter clock frequency = fPCK.
= 1: Input filter clock division factor = 2. Filter clock frequency = fPCK/2.
MCR1: The MCR1 is an 8-bit read/write register which configures the FLGa and FLGb output functionality.
In addition, the MCR1 can be used to enable/disable counting.Upon power-up, the MCR1 is cleared to zero:
MCR1: B7 B6 B5 B4 B3 B2 B1 B0
B0
= 1: Enable Carry on FLGa (flags CNTR overflow; latched or unlatched logic low on carry).
B1
= 1: Enable Borrow on FLGa (flags CNTR underflow, latched or unlatched logic low on borrow).
B2
= 1: Enable Compare on FLGa (In free-running count mode a latched or unlatched logic low is generated in
both up and down count directions at CNTR = IDR. In contrast, in range-limit and mod-n count modes a
latched or unlatched low is generated at CNTR = IDR in the up-count direction only.
B3 = 1: Enable index on FLGa (flags index, latched or unlatched logic low when INDX input is at active level)
B5B4 = 00: FLGb disabled (fixed high)
= 01: FLGb =
Sign, high for negative signifying CNTR underflow, low for positive.
= 10: FLGb =
Up/Down count direction, high in count-up, low in count-down.
B6
= 0: Enable counting.
= 1: Disable counting.
B7
= 0: FLGa is latched.
= 1: FLGa is non-latched and instantaneous.
NOTE: Carry, Borrow, Compare and Index can all be simultaneously enabled on FLGa.
7766-111406-4


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