M38265EBFS datasheet(47/91 Pages) RENESAS

47 / 91 page

Rev.1.00

Sep 06, 2006

page 47 of 88

REJ03B0181-0100

3826 Group (One Time PROM version)

(frequency of count source for LCDCK)

(divider division ratio for LCD)

f(LCDCK)=

f(LCDCK)

duty ratio

Frame frequency=

Fig. 49 LCD display RAM map

Common Pin and Duty Ratio Control

The common pins (COM0–COM3) to be used are determined by

duty ratio.

Select duty ratio by the duty ratio selection bits (bits 0 and 1 of the

LCD mode register).

After reset, the VCC (VL3) voltage is output from the common pins.

LCD Display RAM

Addresses 004016 to 005316 are the designated RAM for the LCD

display. When “1” are written to these addresses, the correspond-

ing segments of the LCD display panel are turned on.

LCD Drive Timing

The frequency of internal signal LCDCK decided LCD drive timing

and the frame frequency can be determined with the following

equation:

Table 13 Duty ratio control and common pins used

Duty

ratio

Common pins used

Notes 1: COM2 and COM3 are open.

2: COM3 is open.

Bit 1

Bit 0

COM0, COM1 (Note 1)

COM0–COM2 (Note 2)

COM0–COM3

Duty ratio selection bits

Segment Signal Output Pins

Segment signal output pins are classified into the segment-only

pins (SEG0–SEG17), the segment or output port pins (SEG18–

SEG25), and the segment or I/O port pins (SEG26–SEG39).

Segment signals are output according to the bit data of the LCD

RAM corresponding to the duty ratio. After reset, a VCC (=VL3)

voltage is output to the segment-only pins and the segment/out-

put port pins are the high impedance condition and pulled up to

VCC (=VL3) voltage.

Also, the segment/I/O port pins (SEG26–SEG39) are set to input

mode as I/O ports, and VCC (=VL3) is applied to them by pull-up

resistor.

004016

004116

004216

004316

004416

004516

004616

004716

004816

004916

004A16

004B16

004C16

004D16

004E16

004F16

005016

005116

005216

005316

Bit

Address

SEG1

SEG3

SEG5

SEG7

SEG9

SEG11

SEG13

SEG15

SEG17

SEG19

SEG21

SEG23

SEG25

SEG27

SEG29

SEG31

SEG33

SEG35

SEG37

SEG39

765

432

COM3

COM0

COM2 COM1 COM0 COM3 COM2 COM1

SEG0

SEG2

SEG4

SEG6

SEG8

SEG10

SEG12

SEG14

SEG16

SEG18

SEG20

SEG22

SEG24

SEG26

SEG28

SEG30

SEG32

SEG34

SEG36

SEG38

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