Difference between revisions of "84PCE:Ports:0005"
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(Created page with "0005 - Unknown == Synopsis == '''Port Number:''' 0005 '''Function:''' Unknown == Details == This port is unknown. === Bits [4:0] === La...") |
((Mostly) not unknown) |
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| − | [[Category:84PCE:Ports:By_Address|0005 - | + | [[Category:84PCE:Ports:By_Address|0005 - Port access controls]] |
== Synopsis == | == Synopsis == | ||
'''Port Number:''' 0005 | '''Port Number:''' 0005 | ||
| − | '''Function:''' | + | '''Function:''' Controls access to ports & the backlight PWM. |
== Details == | == Details == | ||
| − | This port | + | This port enables access to various parts of the ASIC. |
| − | === | + | === Bit [0] === |
| + | Enables access to [[84PCE:Ports:F000|F000]] port range. | ||
| + | |||
| + | === Bit [1] === | ||
| + | Enables access to [[84PCE:Ports:E000|E000]] port range (ARM coprocessor). | ||
| + | |||
| + | === Bit [2] === | ||
| + | Enables access to [[84PCE:Ports:D000|D000]] port range (LCD SPI). | ||
| + | |||
| + | === Bit [3] === | ||
Latches value written, no apparent effect. | Latches value written, no apparent effect. | ||
| + | |||
| + | === Bit [4] === | ||
| + | Enables access to [[84PCE:Ports:B000_Unknowns|B000]] port range (backlight). | ||
=== Bit [5] === | === Bit [5] === | ||
| − | + | Enables writes to [[84PCE:Ports:A000|A000]] port range (keypad). When disabled, read access still succeeds. | |
=== Bit [6] === | === Bit [6] === | ||
| − | + | Enables the backlight PWM. When disabled, the screen will be fully dark or bright, depending on which part of the PWM cycle it was in when last enabled. | |
=== Bit [7] === | === Bit [7] === | ||
Writes have no apparent effect, value does not latch. | Writes have no apparent effect, value does not latch. | ||
Latest revision as of 23:57, 20 February 2021
Contents
Synopsis
Port Number: 0005
Function: Controls access to ports & the backlight PWM.
Details
This port enables access to various parts of the ASIC.
Bit [0]
Enables access to F000 port range.
Bit [1]
Enables access to E000 port range (ARM coprocessor).
Bit [2]
Enables access to D000 port range (LCD SPI).
Bit [3]
Latches value written, no apparent effect.
Bit [4]
Enables access to B000 port range (backlight).
Bit [5]
Enables writes to A000 port range (keypad). When disabled, read access still succeeds.
Bit [6]
Enables the backlight PWM. When disabled, the screen will be fully dark or bright, depending on which part of the PWM cycle it was in when last enabled.
Bit [7]
Writes have no apparent effect, value does not latch.
