Zeroko: Created page with "000D - Power control == Synopsis == '''Port Number:''' 000D '''Function:''' Power control == Details == This port enables power to vario..."

2021-02-21T05:23:23Z

Created page with "000D - Power control == Synopsis == '''Port Number:''' 000D '''Function:''' Power control == Details == This port enables power to vario..."

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[[Category:84PCE:Ports:By_Address|000D - Power control]]
== Synopsis ==
'''Port Number:''' 000D

'''Function:''' Power control

== Details ==

This port enables power to various parts of the ASIC. Each region reads as 0 when unpowered.

=== Bit [0] ===
[[84PCE:Ports:3000|USB controller]] power. Resets when unpowered. Returning to the OS without reinitializing causes it to freeze while USB is connected.

=== Bit [1] ===
[[84PCE:Ports:4000|LCD controller]] power. Resets when unpowered. The LCD does not update until the controller is initialized properly.

=== Bit [2] ===
Power for RAM range D20000-D3FFFF. When unpowered, its content is quickly randomized.

=== Bit [3] ===
Power for VRAM range D40000-D7FFFF. When unpowered, its content is quickly randomized.

=== Bits [4:7] ===
Writes have no effect. These bits read as 1 if the subsystems controlled by the corresponding bits in 0-3 are receiving power. There is a slight delay between changing bits 0-3 & these changing in response.

84PCE:Ports:000D - Revision history

Zeroko: Created page with "000D - Power control == Synopsis == '''Port Number:''' 000D '''Function:''' Power control == Details == This port enables power to vario..."