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■ 11.2 Special priority function

Special priority function is a function that changes the least significant bit of the 3-bit priority number corresponding to each scroll screen for each character or dot. By using this function and changing the priority of a certain part of the scroll screen, you can make one scroll screen appear to have multiple screens. Note that only the least significant bit of the priority number changes depending on the special priority function, and the register value is used as it is for the upper 2 bits. The special priority function has the following three modes.

(1) The least significant bit of the priority number is specified for each screen
(2) The least significant bit of the priority number is specified for each character
(3) The least significant bit of the priority number is specified for each dot

When specifying the least significant bit of the priority number for each screen, the value of the priority number register corresponding to each scroll screen is used as it is.
When specifying for each character, the value of the special priority bit in the pattern name data is used as the least significant bit of the priority number. Refer to " 4.6 Pattern Name Table (Page) " for special priority bits.
When specifying for each dot, the least significant bit of the priority number is set to 1 only for dots that match the dot color code specified in the special function code in the character pattern in which the special priority bit in the pattern name data is set to 1. Otherwise, the least significant bit is fixed to 0. Do not set this mode when the scroll screen color format is RGB. Please refer to “ 10.3 Special Function Code ” for dot color code.
* When the value of the 3-bit priority number obtained by the special priority function is 0H, the screen, character or dot is considered transparent.
Table 11.2 shows the special priority functions by mode.

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