Pepper-computer Modular Computers RS485 Manual do Utilizador descarregar pdf (Página 62)

100

101

SMART I/O User’s Manual

March 12, 1996

Page 2 - 22

Chapter 2 SMART-BASE

Example for a Square Wave Generator

The Timer Control Register

In this configuration, the timer produces a square wave at the TOUT pin

which is connected to the user’s circuitry. The TIN pin may be used as a

clock input. The processor loads the counter preload registers and the timer

control register and then enables the timer. When the 24-bit counter passes

from $000001 to $000000, the ZDS status bit is set and the TOUT is

toggled. At the next clock to the 24-bit counter it is again loaded with the

contents of the CPRs and thereafter decrements.

76543210

TOUT/TIAC

Control

Z.D.

Control

•

Clock

Control

Timer

Enable

0 1 x 0 0 00 or 1x Changed

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 319 320

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Pepper-computer Modular Computers RS485 Manual do Utilizador Página 62

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