UPD78F1502AGK-GAK-AX Datasheet, PDF (684/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 16 LCD CONTROLLER/DRIVER
Figure 16-3. Format of LCD Display Mode Register (LCDM)
Address: FFF41H After reset: 00H R/W
Symbol
<7>
<6>
<5>
LCDM LCDON
SCOC
VLCON
<4>
BLON
<3>
LCDSEL
2
LCDM2
1
LCDM1
0
LCDM0
LCDON
0
0
1
1
SCOC
0
1
0
1
LCD display enable/disable
Output ground level to segment/common pin
Display off (all segment outputs are deselected.)
Output ground level to segment/common pin
Display on
VLCON
0
1
Voltage boost circuit or capacitor split circuit operation enable/disable
Stops voltage boost circuit or capacitor split circuit operation
Enables voltage boost circuit or capacitor split circuit operation
BLON
0
0
1
1
LCDSEL
0
1
0
1
Display data area control
Displaying an A-pattern area data (lower four bits of LCD display data memory)
Displaying a B-pattern area data (higher four bits of LCD display data memory)
Alternately displaying A-pattern and B-pattern area data (blinking display corresponding to
the constant-period interrupt (INTRTC) timing of the real-time counter (RTC))
LCDM2
LCDM1
0
0
0
0
0
1
0
1
1
0
1
1
Other than above
LCDM0
0
1
0
1
0
1
LCD controller/driver display mode selection
External resistance
Internal voltage
Capacitor split method
division method
boosting method
Number of Bias mode Number of Bias mode Number of Bias mode
time slices
time slices
time slices
4
1/3
4
1/3
4
1/3
3
1/3
3
1/3
3
1/3
2
1/2
4
1/3
4
1/3
3
1/2
4
1/3
4
1/3
Static
Setting prohibited
8
1/4
8
1/4
4
1/3
Setting prohibited
Cautions 1. When LCD display is not performed or necessary, set SCOC and VLCON to 0, in order to reduce
power consumption.
2. When the external resistance division method has been set (MDSET1 = MDSET0 = 0), do not set
VLCON to 1.
3. Set BLON and LCDSEL to 0 when 8 has been selected as the number of time slices for the
display mode.
4. To use the internal voltage boosting method, specify the reference voltage by using the VLCD
register (or perform a reset to use the default value of the reference voltage), wait for the
reference voltage setup time (2 ms (min.)), and then set VLCON to 1.
R01UH0004EJ0501 Rev.5.01
668
Jun 20, 2011