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LS7366 Scheda tecnica(PDF) 4 Page - LSI Computer Systems

Il numero della parte LS7366
Spiegazioni elettronici  32 BIT QUADRATURE COUNTER WITH SERIAL INTERFACE
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Homepage  http://www.lsicsi.com
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7366-112204-4
ABSOLUTE MAXIMUM RATINGS: (All voltages referenced to Vss)
Parameter
Symbol
Values
Unit
DC Supply Voltage
VDD
+7.0
V
Voltage
VIN
Vss - 0.3 to VDD + 0.3
V
Operating Temperature
TA
-25 to +85
oC
Storage Temperature
TSTG
-65 to +150
oC
MDR1. The MDR1 (Mode Register 1) is an 8-bit read/write register which is appended to MDR0 for additional modes.
Upon power-up MDR1 is cleared to zero.
B7
B6
B5
B4
B3
B2
B1
B0
B1 B0 = 00: 4-byte counter mode
= 01: 3-byte counter mode
= 10: 2-byte counter mode.
= 11: 1-byte counter mode
B2 = 0: Enable counting
= 1: Disable counting
B3 = : not used
B4 = 0: NOP
= 1: FLAG on IDX (B4 of STR)
B5 = 0: NOP
= 1: FLAG on CMP (B5 of STR)
B6 = 0: NOP
= 1: FLAG on BW (B6 of STR)
B7 = 0: NOP
= 1: FLAG on CY (B7 of STR)
MDR0. The MDR0 (Mode Register 0) is an 8-bit read/write register that sets up the operating mode for the LS7366. The MDR0 is
written into by executing the "write-to-MDR0" instruction via the instruction register. Upon power up MDR0 is cleared to zero.
The following is a breakdown of the MDR bits:
B7
B6
B5
B4
B3
B2
B1
B0
B1 B0 = 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).
B3 B2 = 00: free-running count mode.
= 01: single-cycle count mode (counter disabled with carry or borrow, re-enabled with reset or load).
= 10: range-limit count mode (up and down count-ranges are limited between DTR and zero,
respectively; counting freezes at these limits but resumes when direction reverses).
= 11: modulo-n count mode (input count clock frequency is divided by a factor of (n+1),
where n = DTR, in both up and down directions).
B5 B4 = 00: disable index.
= 01: configure index as the "load CNTR" input (transfers DTR to CNTR).
= 10: configure index as the "reset CNTR" input (clears CNTR to 0).
= 11: configure index as the "load OTR" input (transfers CNTR to OTR).
B6 = 0: Negative index input
= 1: Positive index input
B7 = 0: Filter clock division factor = 1
= 1: Filter clock division factor = 2
NOTE: Applicable to both
LFLAG/ and DFLAG/


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