Video Timing Register

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Revision as of 13:02, 11 November 2019 by Ped7g (talk | contribs) (core 3.0 changes/refresh)
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Number $11
Readable Yes
Writable Yes
Short Description Sets video output timing variant.

(writable in config mode only)

Bit Function
7-3 Reserved, must be 0
2-0 video signal timing variant

Possible timing variants:

Bit pattern selected variant
%000 Base VGA timing, clk28 = 28000000
%001 VGA setting 1, clk28 = 28571429
%010 VGA setting 2, clk28 = 29464286
%011 VGA setting 3, clk28 = 30000000
%100 VGA setting 4, clk28 = 31000000
%101 VGA setting 5, clk28 = 32000000
%110 VGA setting 6, clk28 = 33000000
%111 HDMI, clk28 = 27000000

Each VGA setting increases the frequency by approximately 1 kHz.

50/60Hz depending on bit 2 of Peripheral 1 Register ($05).