61
FLD controller
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FLD automatic display RAM
The FLD automatic display RAM uses the 224 bytes of addresses 0500
16
to 05DF
16
. For FLD, the 3 modes
of 16-timing ordinary mode, 16-timinggradation 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-timingOrdinary Mode
This mode is used when the display timing is 16 or less. The 112 bytes of addresses 0570
16
to 05DF
16
are used as a FLD display data store area. Because addresses 0500
16
to 056F
16
are not used as the
automatic display RAM, they can be the ordinary RAM.
(2) 16-timingGradation 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 0500
16
to 05DF
16
are used. The 112 bytes of addresses
0570
16
to 05DF
16
are used as an FLD display data store area, while the 112 bytes of addresses 0500
16
to 056F
16
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 0500
16
to 05DF
16
are used as an FLD display data store area.
The FLD data pointer (address 0358
16
) 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.
Figure 44. FLD Automatic Display RAM Assignment
16-timingordinary mode
05DF
16
0570
16
0500
16
05DF
16
0500
16
05DF
16
0570
16
0500
16
16-timinggradation display mode
32-timing mode
1 to 32 timing display
data stored area
Gradation display
control data stored
area
1 to 16 timing display
data stored area
1 to 16 timing display
data stored area
Not used