UPD78F9418A NEC, UPD78F9418A Datasheet - Page 218

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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14.8.2 Two-time-slice display example
connected to the segment signals (S0 to S27) and the common signals (COM0 and COM1) of the µ PD789407A or
789417A Subseries chip. This example displays data "123456.7" in the LCD panel. The contents of the display data
memory (addresses FA00H to FA1BH) correspond to this display.
is necessary to apply the select or deselect voltage to the S16 to S19 pins according to Table 14-8 at the timing of
the common signals COM0 and COM1; see Figure 14-12 for the relationship between the segment signals and LCD
segments.
must contain xx10.
the select voltage is applied to S19 at the timing of COM1, an alternate rectangle waveform, +V
generated to turn on the corresponding LCD segment.
218
Figure 14-13 shows how the seven-digit LCD panel having the display pattern shown in Figure 14-12 is
The following description focuses on numeral "3" ( ) displayed in the fifth digit. To display "3" in the LCD panel, it
According to Table 14-8, it is determined that the display data memory location (FA13H) that corresponds to S19
Figure 14-14 shows examples of LCD drive waveforms between the S19 signal and each common signal. When
Remark
n = 0 to 6
Figure 14-12. Two-Time-Slice LCD Display Pattern and Electrode Connections
S
4n+3
S
4n+2
Table 14-8. Select and Deselect Voltages (COM0 and COM1)
Common
COM0
COM1
Segment
CHAPTER 14 LCD CONTROLLER/DRIVER
User’s Manual U13952EJ3V0UD
S
S
Deselect
4n
4n+1
Select
S16
Select
Select
S17
Deselect
Select
S18
COM0
Deselect
Select
S19
COM1
LCD
/−V
LCD
, is