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■ Line & vertical cell scroll control register

Line & vertical cell scroll control register controls line scroll function and vertical cell scroll function. This is a write-only 16-bit register at address 18009AH. The value is cleared to 0 after power-on or reset, so be sure to set it.

Line scroll interval bit : Line scroll select bit (N0LSS1, N0LSS0, N1LSS1, N1LSS0)

Specify the interval for reading the line scroll table data from the table. The interval varies depending on the interlace setting on the TV screen.

N0LSS1, N0LSS0 18009AH bits 5,4 NBG0 For
N1LSS1, N1LSS0 18009AH Bit 13,12 For NBG1

NxLSS1NxLSS0Interlace settings
Non-interlaced Single-dense interlaced Double-dense interlaced
0 0 For each line For every two lines 1 Every line
0 1 every 2 lines every 4 lines 2 Every line
1 0 every 4 lines every 8 lines 4 Every line
1 1 every 8 lines every 16 lines 8 Every line
[Note] 0 or 1 is entered in x of the bit name.

When reading the data of the line scroll table at intervals of 2 lines or more, the line scroll data read before that is used for the horizontal screen scroll value and the horizontal coordinate increment of the lines that are not read. The vertical screen scroll value is calculated from the previously read line scroll data and the value of the vertical coordinate increment register.

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