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26 Introduction
I/O Functions for Timer/Counter Objects
For multiplexed I/O objects, the last timer/counter I/O object declared in the
program is the first to take effect after a reset. To change the selected I/O object,
use the io_select( ) function to specify which of the multiplexed pins is the owner
of the timer/counter circuit.
The syntax for the io_select( ) function is:
io_select (
io-object-name
[,
clock
] )
io-object-name
The name for the I/O object, which corresponds to the
io-object-name
in the
I/O object declaration.
clock
Specifies a clock selector, which can be different from or the same as the clock
selector specified in the object’s declaration, in the range of 0 to 7. If you do
not specify a
clock
value in the call to the io_select( ) function, the
clock
value
is set to the value in the I/O object’s declaration.
Any timer/counter I/O object that has a
clock
argument in its declaration syntax
can also be reprogrammed to an alternate clock value by using the io_set_clock( )
function.
The syntax for the io_set_clock( ) function is:
io_set_clock (
io-object-name
,
clock
)
io-object-name
The name for the I/O object, which corresponds to the
io-object-name
in the
I/O object declaration.
clock
Required clock selector value in the range of 0 to 7 (for Series 3100 devices) or
0 to 15 (for Series 5000 devices), regardless of the clock selector specified in
the object’s declaration. Some I/O objects might not function properly with
all clock values. See the description for a particular I/O object in Chapter
5,
Timer/Counter Input
, on page 123, and Chapter 6,
Timer/Counter Output
,
on page
155.
See Appendix
A,
Timer/Counter Periods and Resolution
, on page 187, for a
description of how the io_set_clock( ) function affects the resolution and range
of certain timer/counter I/O models.
When io_set_clock( ) is used on multiplexed objects, the clock is changed
regardless of whether the object itself is currently selected.
Example: The following code fragment shows several examples of the use of
io_select( ) and io_set_clock( ):
IO_1 output pulsecount clock(3) outPulsecount;
IO_5 input period clock(2) inPeriod;
IO_6 input ontime clock(3) inOntime;
when (reset) {
io_set_clock(outPulsecount, 5);
io_select(inOntime);
- I/O Model Reference for Smart 1
- Transceivers and Neuron Chips 1
- Welcome 3
- Audience 3
- Related Documentation 3
- Mini FX User’s Guide 4
- Series 5000 Chip Data Book 4
- Table of Contents 5
- Introduction 11
- Overview 12
- Direct I/O Models 14
- Parallel I/O Models 14
- Serial I/O Models 15
- Overlaying I/O Objects 18
- I/O Timing Issues 22
- Information 24
- Multiplexing I/O Models 28
- General I/O Functions 28
- Neuron C Reference Guide 29
- I/O Events 31
- Neuron C Programmer’s Guide 31
- Using Functions or Events 35
- Timer/Counter I/O Models 38
- Output Models 39
- Bit Input/Output 42
- Bit Input Example 45
- Bit Output Example 45
- Byte Input/Output 45
- Byte Input Example 47
- Byte Output Example 48
- Leveldetect Input 48
- Nibble Input/Output 50
- Nibble Input Example 53
- Nibble Output Example 53
- Touch Input/Output 53
- Muxbus Input/Output 62
- Parallel Input/Output 65
- Master Program 71
- Slave Program 72
- Slave B Mode 73
- Token Passing 76
- Handshaking 76
- Transferring Data 76
- Resynchronization Procedure 77
- Using the IRQ Signal 80
- Bitshift Input/Output 86
- Bitshift Input Example 90
- Bitshift Output Example 90
- I2C Input/Output 90
- Magcard Bitstream Input 94
- Magcard Input 96
- Magtrack1 Input 99
- Programming Considerations 100
- Syntax 101
- Example 102
- Neurowire Input/Output 102
- Hardware Considerations 102
- Neurowire Master Mode 103
- Neurowire Slave Mode 104
- SCI (UART) Input/Output 108
- Serial Input/Output 113
- Serial Input Example 117
- Serial Output Example 117
- SPI Input/Output 117
- SPI Master 122
- SPI Master (Neurowire 122
- SPI Slave 123
- Wiegand Input 128
- Timer/Counter Input Models 133
- Dualslope Input 135
- Neuron C Resources 138
- Edgelog Input 139
- Infrared Input 144
- Ontime Input 148
- Period Input 151
- Pulsecount Input 155
- Quadrature Input 158
- Totalcount Input 161
- Timer/Counter Output Models 165
- Edgedivide Output 166
- Frequency Output 169
- Infrared Pattern Output 172
- Oneshot Output 175
- Pulsecount Output 178
- Pulsewidth Output 181
- Stretched Triac Output 184
- Triac Output 189
- Example 1 192
- Example 2 193
- Triggered Count Output 193
- Timer/Counter Periods and 197
- Resolution 197
- InputClock 199
- And so on 200
- Period = 201
- Frequency = 1 / 201
- 196 Index 206
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