Echelon I/O Model Reference for Smart Transceivers and Neu Manual de usuario Pagina 168
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158 Timer/Counter Output Models
Symbol Description Minimum Typical Maximum
t
ret
Return from function — 13 μs —
Programming Considerations
For edgedivide output, the data type of the output value for io_out( ) is an
unsigned long. Following reset of the Neuron Chip or Smart Transceiver, the
divider is disabled until the first call to the io_out( ) function. The first call to the
io_out( ) function for the edgedivide output model sets the output pin high and
starts the divider. When the divider is running, the function call to io_out( ) only
sets the value used for the divider and does not affect the state of the output pin.
However, when the output value is 0, the output signal is forced to a low state
and the divider is halted.
Syntax
pin
[output] edgedivide sync (
pin-nbr
) [invert]
io-object-name
[=
initial-output-level
];
pin
An I/O pin. Edgedivide output can specify pins IO_0 or IO_1. If IO_0 is
specified, the multiplexed timer/counter is used and the sync pin can be IO_4
through IO_7. If IO_1 is specified, the dedicated timer/counter is used and
the sync pin must be IO_4.
sync (
pin
-
nbr
)
Specifies the sync pin, which is the counting input signal. By default, the
divider counts negative edges.
invert
This keyword causes positive edges at the sync pin input to be counted rather
than the default negative edges.
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 can be 0
or 1. The default is 0.
Usage
unsigned long
output-value
;
io_out(
io-object-name
,
output-value
);
- 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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