Instruction manual
Table Of Contents
- INTRODUCTION
- GETTING STARTED
- MAKING THE CONNECTIONS
- USING THE PC215E
- STRUCTURE AND ASSIGNMENTS OF THE REGISTERS
- Register Assignments
- Register Groups
- The Register Details
- Programmable Peripheral Interface PPI-X Data Register Port A
- Programmable Peripheral Interface PPI-X Data Register Port B
- Programmable Peripheral Interface PPI-X Data Register Port C
- Programmable Peripheral Interface PPI-X Command Register
- Programmable Peripheral Interface PPI-Y Data Register Port A
- Programmable Peripheral Interface PPI-Y Data Register Port B
- Programmable Peripheral Interface PPI-Y Data Register Port C
- Programmable Peripheral Interface PPI-Y Command Register
- Z1 Counter 0 Data Register
- Z1 Counter 1 Data Register
- Z1 Counter 2 Data Register
- Counter/Timer Z1 Control Register
- Z1 Counter/Timer Status Register
- Z2 Counter 0 Data Register
- Z2 Counter 1 Data Register
- Z2 Counter 2 Data Register
- Counter/Timer Z2 Control Register
- Z2 Counter/Timer Status Register
- Group Z Clock Connection Register
- Group Z Gate Connection Register
- Interrupt Source Selection Register
- Interrupt Status Register
- PROGRAMMING THE PC215E
- Copyright
- Files installed from the Distribution Diskette
- Windows DLL and Examples
- DOS 'C' Library and Examples
- Using the Dynamic Link Library
- Windows and DOS Library Functions
- Initialisation Functions
- Interrupt Control Functions
- Data Buffer Functions
- Timer/Counter Functions
- Differential Counter Functions
- Frequency Generation Functions
- Millisecond Stopwatch Functions
- Frequency Input and Output Functions
- Digitally- and Voltage-Controlled Oscillator Functions
- Digital Input/Output Functions
- Switch Scanner Matrix Functions
- Bi-Directional Data Bus Functions
- PC215E Library Error Codes
- PC215E Interface Guide For LABTECH NOTEBOOK
- Guide to User Programming
- Signal Centre
- CONTENTS
- DECLARATION OF CONFORMITY
PC215E Page 94
6.6.8.6 Divide an External Frequency - TCdivideFreq
Measures an external signal’s frequency, then generates another signal whose frequency is
the external frequency divided by a specified number. N.B. this function is not on-going, and
must be called at a regular interval to keep the generated frequency tracking the external
signal. Note the output signal will be a square wave.
i = TCdivideFreq (h, ipChip, ipChan, opChip, opChan, divisor)
where
h Integer. Board handle as issued by function
registerBoard.
ipChip Integer. Address offset of the timer/counter
chip on which the input frequency will be
measured.
ipChan Integer. Input timer/counter channel on which
to perform the frequency measurement. The
external signal must be connected to the clock
input of this channel. Another timer channel
(chan-2) will also be used to provide the gate
signal. This may be on the previous chip.
opChip Integer. Address offset of the timer/counter
chip on which to generate the output frequency.
One of the following pre-defined constants may
be used:
X1 = 0
X2 = 4
Y1 = 8
Y2 = 12
Z1 = 16
Z2 = 20.
opChan Integer. Output timer/counter channel number
within the chip (0, 1 or 2).
divisor Float. Division Factor
Returns Integer:
OK
or ERRHANDLE
ERRCHAN
ERRDATA
Prior Calls registerBoard
See Also TCmultiplyFreq
TCfreeResource