CTS9513API-2 datasheet(20/28 Pages) ETC

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SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

Rev E

Tuesday, September 25,

CTS9513-2

5 Chan 16 bit 20MHz Counter/Timer

MODE N SOFTWARE TRIGGERED STROBE

WITH

LEVEL GATING AND HARDWARE

RETRIGGERING

In Mode N, once ARMed, the counter is active only

as long at the selected Gate line is asserted.

Counting begins only after the gate line is asserted

after the counter is ARMed. If the Gate line remains

asserted the counter will count to TC, reload

automatically from the load register and disarm itself

until receipt of a new ARM command. If the gate is

deasserted prior to the counter reaching TC the

counter will halt. When the Gate line is reasserted on

a halted counter, the count value is transferred to the

Hold register and the next valid count source edge

will cause the counter to reload from the Load

and

begin

counting

again,

effectively

retriggering the counter as shown in Figure 22.

One application of this mode is to measure the delay

between two successive gate edges by reading the

remainder count value from the hold register.

SOURCE

DATA

ARM COMMAND

GATE

COUNT VALUE

TC OUTPUT

TOGGLE OUTPUT

L-1

L-2

...

N+1

L-1

L-2

...

L-1

COUNTER MODE N WAVEFROMS

Figure 22 - CTS9513 Counter Mode N Representative Waveforms

SOURCE

DATA

ARM COMMAND

GATE

COUNT VALUE

TC OUTPUT

TOGGLE OUTPUT

L-1

L-2

...

N+1

L-1

L-2

...

L-1

COUNTER MODE O WAVEFORMS

Figure 23 - CTS9513 Counter Mode O Representative Waveforms

MODE O SOFTWARE TRIGGERED STROBE

WITH

EDGE GATING AND HARDWARE

RETRIGGERING

Mode O is similar to Mode N in that the counter must

be ARMed and a valid Gate edge must be received

to start the counter. Unlike most other modes,

however, each time a valid gate edge is received

prior to the counter reaching TC will cause the

counter to be retriggered by reloading the counter

from the load register on the first valid source edge

following a valid gate edge. If the counter is allowed

to reach TC is automatically reloads from the Load

The counter is insensitive to gate edges while

disarmed and while counting. The counter is sensitive

only to a valid gate edge while counting.

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