CHAPTER 15 VFD CONTROLLER/DRIVER
306
User’s Manual U11302EJ4V0UM
Figure 15-3. Format of Display Mode Register 0 (2/2)
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
Note 2
0
2.5 MHz < f
X
≤
5.0 MHz
1
1.25 MHz
≤
f
X
≤
2.5 MHz
Note 3
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
X
) used. The noise
eliminator is enabled during VFD display operations.
3.
If f
X
selected is between 1.25 MHz and 2.5 MHz, set DSPM06 to 1 prior to VFD display.
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.
7
1
0
6
5
4
3
2
KSF
SEGS1 SEGS0
DSPM06 DSPM05 SEGS4 SEGS3 SEGS2
Symbol
DSPM0
F F A 0 H
0 0 H
R/W
Note 1
Address
After reset
R/W
Содержание mPD780204
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