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I/O Model Reference 173
Programming Considerations
For 8-bit pulsewidth output, the data type of
output-value
for the io_out( )
function is an unsigned short. An
output-value
of 0 results in a 0% duty cycle. A
value of 255 (the maximum value allowed) results in a 100% duty cycle. The duty
cycle of the pulse train is (
output-value
/256), except when
output-value
is 255; in
that case, the duty cycle is 100%.
For 16-bit pulsewidth output, the data type of
output-value
for the io_out( )
function is an unsigned long. An
output-value
of 0 results in a 0% duty cycle. A
value of 65535 (the maximum value allowed) results in a 99.998% duty cycle.
The duty cycle of the pulse train is (
output-value
/65536).
Important: Do not use an
output-value
of 1 in combination with clock(0).
Syntax
pin
[output] pulsewidth [short | long] [invert] [clock (
const-expr
)]
io-object-name
[=
initial-output-level
];
pin
Specifies either pin IO_0 (using the multiplexed timer/counter) or IO_1 (using
the dedicated timer/counter).
short | long
Resolution of the data value: short specifies 8-bit pulsewidth output, long
specifies 16-bit. If neither of these options is specified, the pulsewidth I/O
object defaults to the 8-bit (short) mode.
invert
Causes the output signal to be inverted, normally high for a 0% duty cycle.
By default, the output signal is normally low for a 0% duty cycle.
clock (
const-expr
)
Specifies a clock in the range 0 to 7, where 0 is the fastest clock and 7 is the
slowest clock. The default clock for pulsewidth output is clock 0. The
io_set_clock( ) function can be used to change the clock.
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.
io-object-name
A user-specified name for the I/O object, in the ANSI C format for variable
identifiers.
initial-output-level
A constant expression, in ANSI C format for initializers, used to set the state
of the output pin of the I/O object at initialization. The initial state is limited
to 0 or 1. The default is 0.
- 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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