Difference between revisions of "Component: IO Expander (PCF8574) (Comms: System)"
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==IO Expander component== | ==IO Expander component== | ||
Provides 8 digital input/output pins arranged into an 8-bit port using a I2C bus connection. Up to eight expanders can be connected to the same I2C peripheral by means of three address pins. Supports the PCF8574 and PCF8574A devices allowing up to 16 expanders to be connected to the same I2C bus ( 8 x PCF8574 + 8 x PCF8574A ). | Provides 8 digital input/output pins arranged into an 8-bit port using a I2C bus connection. Up to eight expanders can be connected to the same I2C peripheral by means of three address pins. Supports the PCF8574 and PCF8574A devices allowing up to 16 expanders to be connected to the same I2C bus ( 8 x PCF8574 + 8 x PCF8574A ). | ||
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| + | COMMSA | ||
==Detailed description== | ==Detailed description== | ||
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==Examples== | ==Examples== | ||
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| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-prop-icon.png]] | | width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-prop-icon.png]] | ||
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Properties''' | | width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Properties''' | ||
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| + | | width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]] | ||
| + | | width="90%" style="background-color:#EAE1EA; color:#4B008D;" | I²C Communications | ||
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| colspan="2" | Pin used for SCL (clock signal) | | colspan="2" | Pin used for SCL (clock signal) | ||
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| − | | width="10%" align="center" style="background-color:# | + | | width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]] |
| − | | width="90%" style="background-color:# | + | | width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Simulation |
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Latest revision as of 17:20, 9 November 2022
| Author | Matrix TSL |
| Version | 1.0 |
| Category | Comms: System |
Contents
IO Expander component
Provides 8 digital input/output pins arranged into an 8-bit port using a I2C bus connection. Up to eight expanders can be connected to the same I2C peripheral by means of three address pins. Supports the PCF8574 and PCF8574A devices allowing up to 16 expanders to be connected to the same I2C bus ( 8 x PCF8574 + 8 x PCF8574A ).
Component Pack
COMMSA
Detailed description
No detailed description exists yet for this component
Examples
No additional examples
Downloadable macro reference
|
ReadPort |
| Reads the value of the IO pins. | |
 - BYTE
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Return |
|
|
WritePort |
| Writes a value to the IO pins. | |
| - BYTE
|
Value |
| Value to write. Range 0-255 | |
 - VOID
|
Return |
|
|
Initialise |
| - VOID
|
Return |
Property reference
|
Properties |
|
I²C Communications |
|
Device Type |
|
|
External Address |
| Selects the value of the three address pins for the MCP23S17. | |
|
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Channel |
| Channel selection | |
|
Stop Delay |
| On older microcontroller devices there is a potential for the I2C hardware channel to lock up if there is not a 10ms delay between an I2C stop event and the next I2C start event. Most modern microcontrollers will not have a problem so this property can be disabled to speed up the I2C communications. | |
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Baud Select |
| Baud rate option selector | |
|
Baud Rate |
| Baud rate to be used | |
|
SDA |
| Pin used for SDA (data signal) | |
|
|
SCL |
| Pin used for SCL (clock signal) | |
|
|
Simulation |
|
Label |
|
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Scope Traces |
| Selects if the scope traces are automatically generated or not | |
|
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Console Data |
| Selects if the console data is automatically generated or not | |
|
|
API |
