Echelon I/O Model Reference for Smart Transceivers and Neu Instrukcja Użytkownika Strona 118
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108 Serial I/O Models
• In master mode, pin IO8 is the clock (driven by the Smart Transceiver),
IO9 is serial data input (Master In Slave Out or MISO), and IO10 is
serial data output (Master Out Slave In or MOSI).
• In slave mode, pin IO8 is the clock input, IO9 is serial data output
(MISO), and IO10 is serial data input (MOSI).
The declaration of the SPI I/O object supports several modifiers, including
neurowire. If the neurowire keyword is used, the pins assume a Neurowire-
compatible direction in which IO9 is always output and IO10 is always input.
Serial data is clocked out on the output pin at the same time as it is clocked in on
the input pin. In SPI master mode, no other masters are allowed on the bus. IO7
can be used as a select pin in slave mode, allowing the Smart Transceiver to
coexist with other slave mode devices on a 3-wire bus. A logic one level on the
select line disables the output drivers of the output pins and puts them in a high
impedance state.
If the Smart Transceiver is the only slave device on the SPI bus, and the master
device does not drive the Slave Select (SS~) signal (the signal is disabled), then
you can initialize the IO7 pin to a value of 1 and use it as an input pin:
• Pin IO7 should be declared as an input pin and externally grounded.
OR
• Pin IO7 must be declared in the following order:
IO_7 output bit io7out = 1; // initialize to '1'
IO_7 input bit io7in;
Note that SS~ should be used whenever possible to ensure proper
synchronization and recovery in the event of framing errors from the master
device.
The bit rates supported by the SPI port are summarized in
Table 39 through
Table 42 on page 110.
Table 39. SPI Master Mode for Series 3100 Power Line Devices
Clock Bit Rate for 10 MHz Bit Rate for 6.5536 MHz
7 19.531 kbps 12.8 kbps
6 39.063 kbps 25.6 kbps
5 78.125 kbps 51.2 kbps
4 156.250 kbps 102.4 kbps
3 312.500 kbps 204.8 kbps
2 625.000 kbps 409.6 kbps
1 1250.000 kbps 819.2 kbps
0 2500.000 kbps 1638.4 kbps
- 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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