Measurement-computing TempBook rev.3.0 Manuel d'utilisateur télécharger pdf (Page 65)

TempBook User’s Manual tbkCommand Reference (

Standard

API) 9-5

tbkConfCntr0

DLL Function

int tbkConfCntr0(uchar config);

tbkConfCntr0(unsigned char config);

QuickBASIC

BtbkConfCntr0% (ByVal config%)

Visual Basic

VBtbkConfCntr0% (ByVal config%)

Turbo Pascal

tbkConfCntr0( config:byte ):integer;

Parameters

uchar config

The configuration of Counter 0 (see table below for definitions)

Description Value Note

Tc0cHighTermCnt 0x30

High on terminal count

Tc0cOneShot 0x32

Hardware retriggerable one-shot

Tc0cDivByNCtr 0x34

Rate Generator

Tc0cSquareWave 0x36

Square wave

Tc0cSoftTrigStrobe 0x38

Software triggered strobe

Tc0cHardTrigStrobe 0x3A

Hardware triggered strobe

Returns

TerrNoError

- No error

See Also

tbkWtCntr0, tbkRdCntr0, tbkSetTrig

Program References

None

tbkConfCntr0

programs the control register of Counter 0 in one of six modes. Counter 0 is a

general purpose counter with input, gate and output lines. The input of counter 0 can be configured

using the

ctr0mode

parameters of the

tbkSetTrig

command.

Mode 0, high on terminal count, is typically used to count events. After the initial count value (see

tbkWtCntr0

) is set, the counter will decrement on each pulse of the Counter 0 input. The count

value at any time can be read using

tbkRdCntr0

. Counter 0 output (pin 2 of P1), which is initially

low, will go high when the counter decrements to 0.

Mode 1, hardware retriggerable one-shot, is used to generate a pulse following the occurrence of a

rising edge of the Counter 0 gate. The output, which is initially high, will go low after the

hardware trigger is received until the count decrements to 0.

Mode 2, rate generator, acts as a divide-by-N counter. The output will be high until the counter

value decrements to 1, when the output goes low for 1 clock pulse before going high again.

Mode 3, square wave generator, is similar to mode 2 except for the duty-cycle. The output will be

high for half of the count value, and low for the other half. If the count value is odd, the

output will remain high for the extra clock pulse.

Mode 4, software triggered strobe, will strobe each time the count value is loaded. The output is

initially high. After the count value is written and has decremented to 1, the output will go

low for one clock pulse before going high again.

Mode 5, hardware triggered strobe, is similar to mode 4 except the strobe is initiated by a hardware

trigger (rising edge of Counter 0 gate).

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 165 166

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Measurement-computing TempBook rev.3.0 Manuel d'utilisateur Page 65

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