M30218 Datasheet, PDF (61/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

FLD controller
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
FLD automatic display RAM
The FLD automatic display RAM uses the 224 bytes of addresses 050016 to 05DF16. For FLD, the 3 modes
of 16-timing ordinary mode, 16-timing•gradation display mode and 32-timing mode are available depending
on the number of timings and the use/not use of gradation display.
The automatic display RAM in each mode is as follows:
(1) 16-timing•Ordinary Mode
This mode is used when the display timing is 16 or less. The 112 bytes of addresses 057016 to 05DF16
are used as a FLD display data store area. Because addresses 050016 to 056F16 are not used as the
automatic display RAM, they can be the ordinary RAM.
(2) 16-timing•Gradation Display Mode
This mode is used when the display timing is 16 or less, in which mode each segment can be set for dark
or bright display. The 224 bytes of addresses 050016 to 05DF16 are used. The 112 bytes of addresses
057016 to 05DF16 are used as an FLD display data store area, while the 112 bytes of addresses 050016
to 056F16 are used as a gradation display control data store area.
(3) 32-timing Mode
This mode is used when the display timing is 16 or greater. This mode can be used for up to 32-timing.
The 224 bytes of addresses 050016 to 05DF16 are used as an FLD display data store area.
The FLD data pointer (address 035816) is a register to count display timings. This pointer has a reload
register and when the terminal count is reached, it starts counting over again after being reloaded with the
initial count. Make sure the timing count – 1 is set to the FLD data pointer. When writing data to this address,
the data is written to the FLD data pointer reload register; when reading data from this address, the value in
the FLD data pointer is read.
16-timing•ordinary mode
050016
Not used
057016
16-timing•gradation display mode
32-timing mode
050016
050016
Gradation display
control data stored
area
057016
1 to 32 timing display
data stored area
1 to 16 timing display
data stored area
1 to 16 timing display
data stored area
05DF16
05DF16
05DF16
Figure KA-4. FLD Automatic Display RAM Assignment
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