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VSC060

Data Sheet

Revision 4.1

January 2008

3.2.92 73h: Pulse Train Control 11 (PTC11)

This register, along with the PTC10 register, provides a user-programmable LED flashing pulse train. The

user can adjust the pulse duration, the pulse train length, and the on/off time to derive a specific visual

indication. The PTC10 register provides eight of the twelve bits available in the programmable pulse train.

The PTC11 register contains two bits of pulse-width programmability, two bits of pulse train length

programmability, and the remaining four bits of the programmable pulse train.

As an example, the pulse train can be used to develop a visual heartbeat indication by programming the

PTC10 register with a 45h and the PTC11 register with a C1h. This combination develops a pulse train

with two blinks followed by a gap with the on times of the LED equal to 125 ms.

If the default values of this register or the PTC10 register are modified, synchronization to LED flash rates

programmed in other VSC060 devices is disabled.

The following table shows the bit assignments for the Pulse Train Control 11 register.

PTC11

Address:

73h

Reset Value:

0000_0000b

Bit

Bit Label

Access

Description

7:6

TPW1-0

R/W

Train Pulse Width

These two bits define the pulse width of each of the pulse train bits. The

available pulse widths are as follows:

5:4

PTL1-0

R/W

Pulse Train Length

These two bits define the pulse train length, which is the number of pulse train

bits that is shifted out before returning to bit 0. The available pulse train lengths

are as follows:

3:0

PT11-8

R/W

Pulse Train

These four bits are the last bits shifted out from 0 to 3 and define the on/off time

for the flash rate.

1: defines LED on time.

0: defines LED off time.

TPW1

TPW0

Train Pulse Width

41.67 ms

55.55 ms

83.33 ms

125 ms

PTL1

PTL0

Pulse Train Length

12 pulse train bits from 0 to 11

10 pulse train bits from 0 to 9

9 pulse train bits from 0 to 8

8 pulse train bits from 0 to 7

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