MOS Integrated Circuit Data Sheet

252
µ PD17062
20.4.4 Control Data Select Data
The term control data refers to the data that specifies the character size, display position, and color of a
character pattern on the screen. This data is held in CROM (at ×××FH).
The control data select data is held in VRAM and selects control data in CROM.
The 6 bits of the data field correspond to b9 to b4 of the CROM address. Similarly to the pattern select data,
the control data select data also requires that a CROM bank be specified. A CROM bank is specified using
CROMBNK (b0 at 30H) in the register file.
Fig. 20-5 Relationship between the Control Data and CROM Address
b7 b6 b5 b4 b3 b2 b1 b0
10
b
11
1
b
0
1111
Bank data
BANK0: 0
BANK1: 1
Data in VRAM
CROM address