SM8521 Datasheet, PDF (34/56 Pages) Sharp Electrionic Components – 8-Bit Single-Chip Microcomputer

VRAM Configulation
VRAM configulation is shown below.
VRAM, maximum 16 k bytes (160 x 200-dot x 2-
phase or 200 x 160-dot x 2-plane), can be
accessed. LCD diaplays a phase specified.
Address of VRAM0 and VRAM1 is A000H-BFFFH
and C000H-DFFFH respectively.
SM8521
DMA transfers rectangle display data, in arbitrary
size specified in ROM and external RAM, to
VRAM.
NOTE :
Do not write data directly to VRAM while transferring data to
LCD driver (MSB of LCC register is 1 and V-blank flag is 0).
Bit 7 6 5 4 3 2 1 0
dot 0 dot 1 dot 2 dot 3
4-dot/byte
dot data = 00 color 0
01 color 1
10 color 2
11 color 3
0123
160/200-dot
160/200-dot
VRAM
160-dot × 200-dot × 2-plane = 16 k-byte
Fig. 16 VRAM Configuration
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