Pepper-computer Modular Computers RS485 Bedienungsanleitung PDF herunterladen (Seite 66)

100

101

SMART I/O User’s Manual

March 12, 1996

Page 2 - 26

Chapter 2 SMART-BASE

2.6.8 SMTstat

Syntax

error_code SMTstat(u_int8 *value);

Description

This function reads the timer status register and clears it if set.

Input

u_int8 *value

Pointer to a variable in which to place the read

value. 0 represents not set, 1 represents set

Output

error_code SUCCESS

or standard OS-9 error code (refer to the OS-9

Technical Manual Error Codes Section).

Example

RetVal = SMTstat(buffer);

Description of the Timer Status Register (TSR)

The timer status register contains one bit from which the zero detect status

can be determined. The ZDS status bit (bit 0) is an edge-sensitive flip-flop

that is set to one when the 24-bit counter decrements from $000001 to

$000000. The ZDS status bit is cleared to zero following the direct reset

operation or when the timer is halted. This register is always readable

without consequence. A write access performs a direct reset operation if bit

0 in the written data is one!

76543210

•••••••ZDS

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