Pepper Computer RS485, RS232 user manual Opreload

SMART I/O User’s Manual Chapter 2 SMART-BASE

O_PRELOAD	: With this call the counter preload register can be
	set. The syntax is as follows :

<RetVar> := OPERATE(<iovar>, O_PRELOAD, <prevar>);

where the <iovar> is typically t_in and <prevar> is the value for the preload register which lies between 1 and 0xFFFFFF.

O_START_CNTDWN : This function starts the counter counting-down. When the counter reaches zero, it rolls over to the maximum value of 0xFFFFFF on the following clock pulse and starts afresh. The syntax is as follows :

<RetVar> := OPERATE(<iovar>,O_START_CNTDWN,<prevar>);

where the <iovar> is a variable attached to the Timer I/O (typically t_in) and <prevar> may be one of OA_PITCLOCK for selection of the

6 MHz/32 clock input or OA_TIN for selection of t_in inputs.

Page 2 - 36 ©1996 PEP Modular Computers GmbH March 12, 1996