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LS7166 Datasheet(PDF) 3 Page - LSI Computer Systems

No. de pieza LS7166
Descripción Electrónicos  24-BIT QUADRATURE COUNTER
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Fabricante Electrónico  LSI [LSI Computer Systems]
Página de inicio  http://www.lsicsi.com
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LS7166 Datasheet(HTML) 3 Page - LSI Computer Systems

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OSR (Output Status Register). Indicates CNTR status: Accessed by: READ when C/D = 1, CS = 0.
Bit # 7 6 5 4 3 2 1 0
U U U 0/1 0/1 0/1 0/1 0/1
BWT. Borrow Toggle Flip-Flop. Toggles everytime CNTR underflows
generating a borrow.
CYT. Carry Toggle Flip-Flop. Toggles everytime CNTR overflows
generating a carry.
COMPT. Compare Toggle Flip-Flop. Toggles everytime CNTR equals PR
SIGN. Sign bit. Reset ( = 0) when CNTR underflows
Set ( = 1) when CNTR overflows
UP/DOWN. Count direction indicatior in quadrature mode.
Reset ( = 0) when counting down
Set ( = 1) when counting up
(Forced to 1 in non-quadrature mode)
OL(Output latch). The OL is the output port for the CNTR. The 24 bit CNTR Value at any instant can be accessed
by performing a CNTR to OL transfer and then reading the OL in 3 READ cycle sequence of Byte 0 (OL0), Byte 1 (OL1)
and Byte 2 (OL2). The address pointer for OL0/OL1/OL2 is automatically incremented with each READ cycle.
Accessed by
: READ when C/D = 0, CS = 0.
Bit #
7
0 7
0
7
0
OL2
OL1
OL0
(BYTE 2)
(BYTE 1)
(BYTE 0)
Standard Sequence for Loading and Reading OL
:
3
MCR
; Reset OL address pointer and Transfer CNTR to OL
READ OL
; Read Byte 0 and increment address
READ OL
; Read Byte 1 and increment address
READ OL
; Read Byte 2 and increment address
TABLE 1 - Register Addressing Modes
D7 D6 C/D RD WR CS
COMMENT
X X X X
X 1
Disable Chip for READ/WRITE
0 0 1
1
0
Write to Master Control Register (MCR)
0 1
1 1
0
Write to input control register (ICR)
1 0
1 1
0
Write to output/counter control register (OCCR)
1 1
1 1
0
Write to quadrature register (QR)
X X 0 1
0
Write to preset register (PR) and increment register
address counter.
X X 0
1 0
Read output latch (OL) and increment register
address counter
X X 1
1 0
Read output status register (OSR).
X = Don't Care
U = Undefined
7166-110103-3


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