Datasheet

RL78/L12 CHAPTER 14 LCD CONTROLLER/DRIVER
R01UH0330EJ0200 Rev.2.00 628
Dec 13, 2013
14.5.1 A-pattern area and B-pattern area data display
When BLON = LCDSEL = 0, A-pattern area (lower four bits of the LCD display data register) data will be output as the
LCD display register.
When BLON = 0, and LCDSEL = 1, B-pattern area (higher four bits of the LCD display data register) data will be output
as the LCD display register.
See 14.4 LCD Display Data Registers about the display area.
14.5.2 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 clock (RTC). See CHAPTER 7 REAL-TIME CLOCK about the
setting of the RTC constant-period interrupt (INTRTC, 0.5 s setting only) 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.)
See 14.4 LCD Display Data Registers about the display area.
Next, the timing operation of display switching is shown.
Figure 14-16. Switching Operation from A-Pattern Display to Blinking Display
BLON, LCDSEL bits
Segment display
RTC constant-period interrupt
(INTRTC)
BLON = 0, LCDSEL = 0 BLON = 1, LCDSEL = 0 or 1
A-pattern
A-
pattern
B-pattern A-pattern B-pattern
Blinking display always starts from an A pattern.
Figure 14-17. Switching Operation from Blinking Display to A-Pattern Display
BLON = 0, LCDSEL = 0
BLON = 1,
LCDSEL = 0 or 1
A-patternB-patternA-pattern
B -pattern
RTC constant-period interrupt
(INTRTC)
BLON, LCDSEL bits
Segment display