ls7266r1 LSI Computer Systems, Inc., ls7266r1 Datasheet

ls7266r1

Manufacturer Part Number

ls7266r1

Description

24-bit Dual-axis Quadrature Counter

Manufacturer

LSI Computer Systems, Inc.

Datasheet

1.LS7266R1.pdf (15 pages)

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7266R1-102904-1

Byte Pointers: XBP and YBP

The Read and Write operations on an OL or a PR always accesses one byte at a time. The byte that is accessed is

addressed by one of the BPs. At the end of every data Read or Write cycle on an OL or a PR, the associated BP is

automatically incremented to address the next byte.

LS7266R1 Registers:

LS7266R1 has a set of registers associated with each X and Y axis. All X-axis registers have the name prefix X,

whereas all Y-axis registers have the prefix Y. Selection of a specific register for Read/Write is made from the decode

of the three most significant bits (D7 - D5) of the data-bus. CS input enables the IC for Read/Write. C/D input selects

between control and data information for Read/Write. Following is a complete list of LS7266R1 registers.

FEATURES:

• Up to 30MHz count frequency in non-quadrature mode;

• Dual 24-bit counters to support X and Y axes in

• Digital filtering of the input quadrature clocks

• Programmable 8-bit separate filter clock prescalers

• Error flags for noise exceeding filter band width.

• Programmable Index Input and other programmable I/Os.

• Independent mode programmability for each axis.

• Programmable count modes:

• 8-bit 3-State data I/O bus.

• 3V to 5.5V operation (V

• TTL/CMOS compatible I/Os.

• LS7266R1 (DIP); LS7266R1-SD (Skinny DIP);

Preset Registers: XPR and YPR

Each of these PRs are 24-bit wide. 24-bit data can be written into a PR, one byte at a time, in a sequence of three data

write cycles.

Counters: XCNTR and YCNTR

Each of these CNTRs are 24-bit synchronous Up/Down counters. The count clocks for each CNTR is derived from its

associated A/B inputs. Each CNTR can be loaded with the content of its associated PR.

Output Latches: XOL and YOL

Each OL is 24-bits wide. In effect, the OLs are the output ports for the CNTRs. Data from each CNTR can be loaded

into its associated OL and then read back on the data-bus, one byte at a time, in a sequence of three data Read

cycles.

U L

A3800

Up to 4.3MHz clock frequency (17 x 10

x4 quadrature mode.

LS7266R1-S (SOIC); LS7266R1-TS (TSSOP)

motion control applications. • Dual 24-bit comparators.

Quadrature (x1, x2, x4) / Non-quadrature,

Normal / Modulo-N / Range Limit / Non-Recycle,

Binary / BCD.

for each axis.

LSI/CSI

LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747

24-BIT DUAL-AXIS QUADRATURE COUNTER

- V

counts/sec) in

HI BYTE

(PR2)

(OL2)

MID BYTE

(PR1)

(OL1)

0 7

LO BYTE

(OL0)

(PR0)

YLCNTR/YLOL

(GND)

(+5V)

FCK

C/D

PIN ASSIGNMENT

LS7266R1

(631) 271-0400 FAX (631) 271-0405

TOP VIEW

YRCNTR/YABG

YFLG1

YFLG2

XFLG2

XFLG1

XLCNTR/XLOL

XRCNTR/XABG

X/Y

October 2004

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