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Symbol
7
6
5
DSPM0
KSF
DSPM06 DSPM05 SEGS4 SEGS3 SEGS2
R/W DSPM05 Display mode setting
0
Display mode 1 (Segment/character type)
1
Display mode 2 (Type in which a segment spans over two or more grids.)
R/W DSPM06 Subsystem clock noise eliminator mode setting
0
2.5 MHz < f
1.25 MHz ≤ f
1
R
KSF
Timing state
0
Display timing
1
Key scan timing
Notes 1. Bit 7 (KSF) is a read-only bit.
2. Set the values according to the main system clock oscillation frequency (f
eliminator is enabled during VFD display operations.
3. If f
selected is between 1.25 MHz and 2.5 MHz, set DSPM06 to 1 prior to VFD display.
X
Caution When a main system clock frequency below 1.25 MHz is selected and the VFD controller/
driver is used, make sure to use the main system clock for watch timer counting by setting
TCL24 to 0.
306
CHAPTER 15 VFD CONTROLLER/DRIVER
Figure 15-3. Format of Display Mode Register 0 (2/2)
4
3
2
1
SEGS1 SEGS0
≤ 5.0 MHz
X
≤ 2.5 MHz
Note 3
X
User's Manual U11302EJ4V0UM
0
Address
After reset
F F A 0 H
0 0 H
Note 2
R/W
Note 1
R/W
) used. The noise
X
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