CHAPTER 15 VFD CONTROLLER/DRIVER
300
User’s Manual U11302EJ4V0UM
Figure 15-1. VFD Controller Operation Timing in Display Mode 1 (DSPM05 = 0)
DSPM05: Bit 5 of display mode register 0 (DSPM0)
n:
Displayed digits – 1 (Digits 2 to 16 can be selected using display mode register 1 (DSPM1))
T
DSP
:
1 display cycle (1024/f
x
(204.8
µ
s: @ 5.0 MHz operation) or 2048/f
x
(409.6
µ
s: @ 5.0 MHz operation))
T
KS
:
Key scan timing (T
KS
= T
DSP
)
T
CYT
:
Display cycle (T
CYT
= T
DSP
x (Displayed 1))
T
DIG
:
Pulse width of digit signal (Can be selected from 8 types using DSPM1)
Note
The user can select the cut width of the segment signals by setting bits 1 to 3 (DIMS1 to DIMS3) of DSPM1.
Therefore, actual output waveforms may be different from the above illustration and have the cut widths
shown in Figure 15-6.
Remark
If DSPM05 is set to 1, digit signals are output according to the values set in the display RAM.
Segment
signal
Note
Key scan flag
(KSF)
Can be changed
whenever necessary
FIPn
FIP2
FIP1
Digit signal
FIP0
.
.
.
.
.
.
.
.
.
.
.
.
T
DSP
T
CYT
T
KS
T
DIG
1 display cycle
Key scan timing
Содержание mPD780208 Subseries
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