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The
bar allows you to select one of the eight 3-bit priority number registers for each character. For the selection of the sprite priority number register, please refer to “Selection of meaning S priority number ” in “ 9.2 Priority and color calculation ”.
¡The higher the priority number value, the higher the priority of the screen, but the priority when they are equal is determined according to the order shown in Table 11.1. When the priority number is 0H, it is considered transparent.

Table 11.1 Priorities when priority numbers are equal
Priority Normal Enter external screen data
When 		Rotary scroll screen
to display two screens 		Rotary scroll screen
External screen with two screens
Enter
High
↑
│
│
│
│
│
│
│
│
↓
Low 		Sprite Sprite Sprite Sprite
RBG0RBG0RBG0RBG0
NBG0NBG0RBG1RBG1
NBG1 EXBG - EXBG
NBG2 NBG2 - -
NBG3 NBG3 - -

■ Priority number register

The priority number register specifies the priority number. This is a write-only 16-bit register located at addresses 1800F8H to 1800FCH. The value is cleared to 0 after power-on or reset, so be sure to set it.

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