MN5572 Datasheet, PDF (19/28 Pages) Panasonic Semiconductor – Gray Scale Font Engine

I Operation
2. Operating Procedures (continued)
2. 3. Path data write operation example
• Path data write operation flowchart
start
MN5572
Status register check
(status read)
PMS read
PMS verification
FULL PMS
EMPTY or READY
Path data write
(up to 64 double words)
11 : FULL
01 : READY
00 : EMPTY
No
Has 1 frame completed?
Yes
end
• Path data write operation flowchart description
This operation writes the path data to be processed by the IC.
• Status register check
The status register is read and checked.
• PMS verification
The operation performed will be determined by the value of the status register PMS field.
If the PMS field indicates that the FIFO is full, it means that there is no free space in the IC internal memory
and the status register must be checked again after a wait.
If the PMS field indicates empty or ready, a write operation can be started.
• Path data write
The path data for a single figure or font character is input to the path data input port (POINT FIFO).
The maximum amount of path data that can be input at one time is 64 double words. If the data exceeds this
amount, the data must be divided up into 64 double word units and those units must be processed individually.
Fewer than 64 double words can be input if that data includes the path data end code (tag = 011).
• Has 1 frame completed?
If input of the path data for a single figure or font character has completed, the processing terminates. If the
path data is being processed in multiple units, or if there is data that must be input, the status register must be
checked again and another write operation must be performed.
SDF00008BEM
19