Difference between revisions of "84PCE:Ports:0009"

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(Add documentation on bit 4)
Line 15: Line 15:
 
Reset to disable screen. Setting after reset has no effect.
 
Reset to disable screen. Setting after reset has no effect.
  
=== Bits [7:3] ===
+
=== Bit [3] ===
 +
Latches value written, no apparent effect.
 +
 
 +
=== Bit [4] ===
 +
SPI slave select - reset to communicate with the LCD, set to communicate with the Python coprocessor.
 +
 
 +
=== Bits [7:5] ===
 
Latches value written, no apparent effect.
 
Latches value written, no apparent effect.

Revision as of 17:58, 2 October 2021

Synopsis

Port Number: 0009

Function: GPIO A Output

Details

These GPIOs appear to be connected to power control.

Bits [1:0]

Latches value written, no apparent effect.

Bit [2]

Reset to disable screen. Setting after reset has no effect.

Bit [3]

Latches value written, no apparent effect.

Bit [4]

SPI slave select - reset to communicate with the LCD, set to communicate with the Python coprocessor.

Bits [7:5]

Latches value written, no apparent effect.