4524_M Datasheet, PDF (231/310 Pages) Renesas Technology Corp – 4-BIT CISC SINGLE-CHIP MICROCOMPUTER 720 FAMILY / 4500 SERIES

4524 Group
APPLICATION
2.6 LCD function
(3) LCD display method
The 4524 Group has the LCD RAM area for the LCD display.
When “1” is written to a bit in the LCD RAM data, the display pixel which correspond to the bit
automatically turns on.
Figure 2.6.2 shows the LCD RAM map.
Z
1
X
12
13
14
Y
Bits ₃
2
1
0
3
2
1
0
3
2
1
0
8
SEG0 SEG0 SEG0 SEG0 SEG8 SEG8 SEG8 SEG8 SEG16 SEG16 SEG16 SEG16
9
SEG1 SEG1 SEG1 SEG1 SEG9 SEG9 SEG9 SEG9 SEG17 SEG17 SEG17 SEG17
10
SEG2 SEG2 SEG2 SEG2 SEG10 SEG10 SEG10 SEG10 SEG18 SEG18 SEG18 SEG18
11
SEG3 SEG3 SEG3 SEG3 SEG11 SEG11 SEG11 SEG11 SEG19 SEG19 SEG19 SEG19
12
SEG4 SEG4 SEG4 SEG4 SEG12 SEG12 SEG12 SEG12
13
SEG5 SEG5 SEG5 SEG5 SEG13 SEG13 SEG13 SEG13
14
SEG6 SEG6 SEG6 SEG6 SEG14 SEG14 SEG14 SEG14
15
SEG7 SEG7 SEG7 SEG7 SEG15 SEG15 SEG15 SEG15
COM COM3 COM2 COM1 COM0 COM3 COM2 COM1 COM0 COM3 COM2 COM1 COM0
Note: The area marked “
Fig. 2.6.2 LCD RAM map
” is not the LCD display RAM.
2.6.2 Related registers
(1) LCD control register L1
Table 2.6.2 shows the LCD control register L1.
Set the contents of this register through register A with the TL1A instruction. The TAL1 instruction
can be used to transfer the contents of register L1 to register A.
Table 2.6.2 LCD control register L1
LCD control register L1
at reset : 00002 at power down : state retained R/W
Internal dividing resistor for LCD 0 2r ✕ 3, 2r ✕ 2
L13
power supply selection bit (Note 2)
1
r ✕ 3, r ✕ 2
L12 LCD on/off bit
0 Off
1 On
L11 L10
Duty
Bias
L11
00
Not available
LCD duty and bias selection bits ^{0 1}
1/2
1/2
L10
10
1/3
1/3
11
1/4
1/3
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: “r (resistor) multiplied by 3” is used at 1/3 bias, and “r multiplied by 2” is used at 1/2 bias.
Rev.2.00 Aug, 06 2004
REJ09B0107-0200Z
2-67