HCTL2000 datasheet(13/19 Pages) HP

13 / 19 page

low on OE during a falling

clock edge.

6. When OE goes high, the data

lines change to a high imped-

ance state.

7. The IC detects a logic high on

OE during a falling clock edge.

This satisfies the second reset

condition for the inhibit logic.

Actions

1. On the rising edge of the clock,

counter data is transferred to

the position data latch,

provided the inhibit signal is

low.

2. When OE goes low, the

outputs of the multiplexer are

enabled onto the data lines. If

SEL is low, then the high order

data bytes are enabled onto the

data lines. If SEL is high, then

the low order data bytes are

enabled onto the data lines.

3. When the IC detects a low on

OE and SEL during a falling

clock edge, the internal inhibit

signal is activated. This blocks

new data from being

transferred from the counter to

the position data latch.

4. When SEL goes high, the data

outputs change from the high

byte to the low byte.

5. The first of two reset condi-

tions for the inhibit logic is

met when the IC detects a

logic high on SEL and a logic

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