Display Type In Which A Segment Spans Two Or More Grids (Display Mode 2: Dspm05 = 1); Display Data Memory Configuration And Data Reading Order (Display Mode 2) - NEC mPD780208 Subseries User Manual

15.9.3 Display type in which a segment spans two or more grids (display mode 2: DSPM05 = 1)

In display mode 2, all of the display output data are stored in the display data memory.
Figure 15-18 shows the display data RAM configuration and data reading order in a 23-segment x 5-grid display.
Figure 15-18. Display Data Memory Configuration and Data Reading Order (Display Mode 2)
Bit 7
FA70H <1>
FA71H <5>
FA72H
FA73H
FA74H
FA75H
FA76H
Display
FA77H
data
memory
FA78H
FA79H
FA7AH
FA7BH
FA7CH
FA7DH
FA7EH
FA7FH
Remarks 1. <1> through <5> show the display output data reading order.
2. The slashed area shows the segment data storage area.
3. The shaded area shows the grid data storage area.
In the case of example (3) in 15.9, the contents of the data memory areas indicated by shading and slashes are
as shown in Figure 15-21.
T0 through T6 in display mode 2 are for display patterns. Therefore, designate bits 4 to 7 (DIGS0 to DIGS3)
of display mode register 1 (DSPM1) as 7 patterns, and bits 0 to 4 (SEGS0 to SEGS4) of display mode register 0
(DSPM0) as 28 display outputs in total.
If there is some memory area where rewriting display output data is unnecessary, it should be masked by setting
display mode register 2 (DSPM2).
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CHAPTER 15 VFD CONTROLLER/DRIVER
0 7 0 7
FA60H <2> FA50H <3>
FA61H FA51H
FA62H FA52H
FA63H FA53H
FA64H FA54H
FA65H FA55H
FA66H FA56H
FA67H FA57H
FA68H FA58H
FA69H FA59H
FA6AH FA5AH
FA6BH FA5BH
FA6CH FA5CH
FA6DH FA5DH
FA6EH FA5EH
FA6FH FA5FH
User's Manual U11302EJ4V0UM
0 7 0 7
<4> FA40H FA30H
FA41H FA31H
FA42H FA32H
FA43H FA33H
FA44H FA34H
FA45H FA35H
FA46H FA36H
FA47H FA37H
FA48H FA38H
FA49H FA39H
FA4AH FA3AH
FA4BH FA3BH
FA4CH FA3CH
FA4DH FA3DH
FA4EH FA3EH
FA4FH FA3FH
0
T0
T1
T2
T3
T4
T5
T6 T
KS
T7
T8
T9
T10
T11
T12
T13
T14
T15