3-State Output Mode - Sony LZ51-B Bedienungsanleitung

5-3.

3-state Output Mode

(1) Data is not normally output during 3-state output mode. (All outputs are OFF.)
Output of the requested data specified by the initial settings can be held by inputting the data request signals DRQ1, DRQ2
and DRQ3.
When the LY51's external universal input EX.IN has been latched, EX.IN can be used instead of DRQ. However, the
operation time differs.
(2) The timing from when the data request signal DRQ is input until the data is output is as follows.
BCD data
Sign
READY
(when negative
logic)
DRQ
(EX.IN)
About
∆
3 ms + T
Note 1: Leave 5 ms or more between repeated DRQ inputs.
Note 2: Do not input multiple DRQ signals at the same time, as this
may result in misoperation.
Note 3: Refer to the following page for
The data is held until
DRQ input stops.
Valid
5 ms
or more until
the next data
request
∆
T.
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