522
Chapter 15
LCD Controller/Driver
Preliminary User’s Manual U14913EE1V0UM00
15.7 Display
Mode
15.7.1 4-time-division display example
Figure 15-9 shows the connection of a 4-time-division type 10-digit LCD panel with the display pattern
shown in Figure 15-8 with the µPD703123 Subseries segment signals (S0 to S19) and common signals
(COM0 to COM3). The display example is “1234567890,” and the display data memory contents
(addresses FA59H to FA6CH) correspond to this.
An explanation is given here taking the example of the 5th digit “6” (). In accordance with the display
pattern in Figure 15-8, selection and non-selection voltages must be output to pins S8 and S9 as shown
in Table 15-8 at the COM0 to COM3 common signal timings.
Table 15-8: Selection and Non-Selection Voltages (COM0 to COM3)
S: Selection, NS: Non-selection
From this, it can be seen that 0101 must be prepared in the display data memory (address H)
corresponding to S8.
Examples of the LCD drive waveforms between S8 and the COM0 and COM1 signals are shown in Fig-
ure 15-10 (for the sake of simplicity, waveforms for COM2 and COM3 have been omitted). When S8 is
at the selection voltage at the COM0 selection timing, it can be seen that the +V
LCD
/–V
LCD
AC square
wave, which is the LCD illumination (ON) level, is generated.
Figure 15-8: 4-Time-Division LCD Display Pattern and Electrode Connections
Remark:
n = 0 to 9
Segment
S8
S9
Common
COM0
S
S
COM1
NS
S
COM2
S
S
COM3
NS
S
COM0
S
2n
COM1
S
2n + 1
COM2
COM3
Summary of Contents for V850E/CA1 ATOMIC
Page 6: ...6 Preliminary User s Manual U14913EE1V0UM00 MEMO ...
Page 52: ...52 Preliminary User s Manual U14913EE1V0UM00 MEMO ...
Page 144: ...144 Preliminary User s Manual U14913EE1V0UM00 MEMO ...
Page 162: ...162 Preliminary User s Manual U14913EE1V0UM00 MEMO ...
Page 224: ...224 Preliminary User s Manual U14913EE1V0UM00 MEMO ...
Page 308: ...308 Preliminary User s Manual U14913EE1V0UM00 MEMO ...
Page 512: ...512 Preliminary User s Manual U14913EE1V0UM00 MEMO ...
Page 564: ...564 Preliminary User s Manual U14913EE1V0UM00 MEMO ...
Page 566: ...566 Preliminary User s Manual U14913EE1V0UM00 MEMO ...
Page 584: ...584 Preliminary User s Manual U14913EE1V0UM00 MEMO ...