item 

 NBG0 to NBG3 

 Character Colors 

 16 

256

2048

32768

167710,000 

 Reduction setting 

 1x 

 1 / 2x 

 1 / 4x 

 1x 

 1/2 times 

 1 times 

 1x 

 1x 

 
 VRAM access count required during one cycle 

 1 

2

4

2

4

4

4

8

Table 3.4 Character pattern data read access specification restrictions

Item	TV screen Mode	Pattern name table data access timing
		T0	T1	T2	T3	T4	T5	T6	T7
Character pattern Table data Timing when access is specified	Normal	T0 to T2, T4 to T7	T0 to T3, T5 to T7	T0 to T3, T6 to T7	T0 to T3, T7	T0 ~ T3	T1 ~ T3	T2 , T3	T3
	High-resolution, Dedicated monitor	T0 ~ T2	T1-T3	T0, T2, T3	T0, T1, T3	-	-	-	−

If the reduction setting is 1 and character pattern data read access is required more than once, all character pattern data read access must comply with the specified restrictions. If the reduction setting is 1/2 or 1/4, the number of accesses required when the reduction setting is 1 time (1 when the number of character colors is 16 or 2 when the number of characters is 256) , You must ensure that you comply with the restrictions imposed by one pattern name data read access. For example, when the number of character colors is 256 and the reduction setting is 1/2, the specification restrictions on character pattern data read access when pattern name data read access is specified as T1 and T3 are as shown in Figure 3.4. The

Figure 3.4 Example of character pattern data read access specification