SM8521 Datasheet, PDF (33/56 Pages) Sharp Electrionic Components – 8-Bit Single-Chip Microcomputer

SM8521
LCDC/DMA
The SM8521 supports LCD controller (LCDC) to
control LCD pannel, in a kind of dot matrix, which
is required external LCD drivers.
LCDC transfers display data in the external VRAM
to the LCD driver. The SM8521 supports a DMA,
which can transfer the data at the High speed,
between ROM and VRAM, VRAM and VRAM, and
external RAM and VRAM, without through the
CPU.
DMA transfers display data in the ROM and
external RAM to VRAM.
ROM address generator
External address bus
Internal
bus
Source/destination register
Timing
generator
VRAM address generator
Interrupt (CPU)
Shift register
LCD driver
Data composition
circuit
External data bus
VRAM
Fig. 15 LCD/DMA Block Diagram
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