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Microprocessor Interface
1. Data transfer format (for command transfers)
A command identification code (control item) must be transferred before the data is transferred when setting up
commands, positions (coordinates), or color codes (color table).
If continuous data transfer mode is not set up, then data transfers of bit map data and sprite (cursor) data also
require that a command identifier code (control item) be transferred before the data is transferred.
Transfer format (example)
①, , : Command identification code (control item)
, , : Command register setup data
:
Serial transfer completes
2. Transfer format (when continuous data transfer mode has been set up)
Continuous data transfer mode must be set up by the data (1 byte) that follows a command identification code
(control item). When a RAM data transfer command is set up and the data transfer started, the data that follows (in
byte units) is all acquired as RAM data.
Note: If continuous data transfer mode is set up, the RAM write address must be set (by command) to automatic
increment mode.
Transfer format (example)
①, :
Command identification code (control item)
:
Command register setup data
, , : RAM data
:
Serial transfer completes and continuous data transfer mode is cleared.
Note: When continuous data transfer mode is cleared, the command register setting is not reset. If the control
microprocessor immediately issues a RAM data transfer command and starts the data transfer, the
LC78711E will switch to continuous data transfer mode once again.
No. 5476-17/43
LC78711E