Difference between revisions of "Video Timing Register"

Revision as of 14:02, 11 November 2019

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:

Each VGA setting increases the frequency by approximately 1 kHz.

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

@@ Line 18: / Line 18: @@
 ! Bit pattern !! selected variant
 |-
-| %000 || Base VGA timing (50/60Hz depending on bit 2 of {{NextRegNo|$05}})
+| %000 || Base VGA timing, clk28 = 28000000
 |-
-| %001 || VGA setting 1
+| %001 || VGA setting 1, clk28 = 28571429
 |-
-| %010 || VGA setting 2
+| %010 || VGA setting 2, clk28 = 29464286
 |-
-| %011 || VGA setting 3
+| %011 || VGA setting 3, clk28 = 30000000
 |-
-| %100 || VGA setting 4
+| %100 || VGA setting 4, clk28 = 31000000
 |-
-| %101 || VGA setting 5
+| %101 || VGA setting 5, clk28 = 32000000
 |-
-| %110 || VGA setting 6
+| %110 || VGA setting 6, clk28 = 33000000
 |-
-| %111 || HDMI
+| %111 || HDMI, clk28 = 27000000
 |}
 Each VGA setting increases the frequency by approximately 1 kHz.
+/60Hz depending on bit 2 of {{NextRegNo|$05}}.