UPD78F1502AGK-GAK-AX Datasheet, PDF (723/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 16 LCD CONTROLLER/DRIVER
16.9.2 Blinking display (Alternately displaying A-pattern and B-pattern area data)
When BLON = 1 has been set, A-pattern and B-pattern area data will be alternately displayed, according to the
constant-period interrupt (INTRTC) timing of the real-time counter (RTC). Refer to CHAPTER 7 REAL-TIME COUNTER
about the setting of the RTC constant-period interrupt (INTRTC) timing.
For blinking display of the LCD, set inverted values to the B-pattern area bits corresponding to the A-pattern area bits.
(Example: Set 1 to bit 0 of 00H, and set 0 to bit 4 of F0400H for blinking display.) When not setting blinking display of the
LCD, set the same values. (Example: Set 1 to bit 2 of F0402H, and set 1 to bit 6 of F0402H for lighting display.)
Figure 16-34. Example of LCD Display Data Setting During Pattern-Switching Display
B-pattern area
A-pattern area
b7
b6
b5
b4
b3
b2
b1
b0
F0405H
F0404H
Set 1 for lighting display.
SEG5
SEG4
F0403H
F0402H
SEG3
SEG2
F0401H
F0400H
SEG1
SEG0
COM3 COM2 COM1 COM0 COM3 COM2 COM1 COM0
Set inverted value for blinking display.
Refer to 16.4 LCD Display Data Memory about the display area.
Next, the timing operation of display switching is shown.
Figure 16-35. Switching Operation from A-Pattern Display to Blinking Display
RTC constant-period interrupt
(INTRTC)
BLON, LCDSEL bits BLON = 0, LCDSEL = 0
BLON = 1, LCDSEL = 0 or 1
Segment display
A-pattern
A-
pattern
B-pattern
A-pattern
B-pattern
Blinking display always starts from an A pattern.
Figure 16-36. Switching Operation from Blinking Display to A-Pattern Display
RTC constant-period interrupt
(INTRTC)
BLON, LCDSEL bits
BLON = 1,
LCDSEL = 0 or 1
BLON = 0, LCDSEL = 0
Segment display _{B-pattern A-pattern B-pattern}
A-pattern
R01UH0004EJ0501 Rev.5.01
707
Jun 20, 2011