M38C89MB datasheet(33/55 Pages) RENESAS

33 / 55 page

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

38C8 Group

Common Pin and Duty Ratio Control

The common pins (COM0–COM31) to be used are determined by

duty ratio.

Select duty ratio by the duty ratio selection bit (bit 0 of the LCD mode

Table 9 Duty ratio control and common pins used

Duty

ratio

Common pins used

Note: The SEG0/COM16–SEG7/COM23 pins are used as the SEG0–SEG7.

The SEG67/COM24–SEG60/COM31 pins are used as the SEG67–SEG60.

COM0–COM15 (Note)

Duty ratio

selection bit

COM0–COM31

Fig. 30 LCD display RAM map

(frequency of count source for LCDCK)

(divider division ratio for LCD)

f(LCDCK)

(duty ratio)

LCD Display RAM

When LCD display RAM address selection bit is “0”, the area of ad-

dresses 034016 to 042F16 is the designated RAM for the LCD dis-

play. When the bit is “1”, the area of addresses 004016 to 012F16 is

the designated RAM for it. When “1”s are written to these addresses,

the corresponding segments of the LCD display panel are turned on.

LCD Drive Timing

The LCDCK timing frequency (LCD drive timing) is generated inter-

nally and the frame frequency can be determined with the following

equation;

f(LCDCK) =

Frame frequency =

000000001000101110111110

0 01110010001011100000000 LSB

000000001101100100001000

0 1000

010001001000000000

000000001010100100001000

0 10000010001001000000000

000000001000100100001000

0 01110011111001000000000

000000001000100100001000

0 00001010001001000000000

000000001000100100001000

0 10001010001001000000000

000000001000101110001000

0 01110010001011100000000

000000000000000000000000

0 00000000000000000000000 MSB

010001011111001110001110

1 11110111110111110111100 LSB

011011000010010001010001

1 00000100000100000100010

010101000100010001010000

1 00000100000100000100010

010001000010001110010000

1 11100111100111100111100

010001000001010001010000

1 00000100000100000100000

010001010001010001010001

1 00000100000100000100000

010001001110001110001110

1 11110100000100000100000

000000000000000000000000

0 00000000000000000000000 MSB

0010001011111001

1 001000101111100 LSB

0011011000010010

0 101101101000000

0010101000100010

0 101010101000000

0010001000010001

1 101000101111000

0010001000001010

0 101000101000000

0010001010001010

0 101000101000000

0010001001110001

001000101000000

COM0

COM1

COM2

COM3

COM4

COM5

COM6

COM7

COM17

COM18

COM19

COM20

COM21

COM22

COM23

0000000000000000

0 000000000000000 MSB

0000000000100010

1 111101111000000 LSB

0000000000100010

1 000001000100000

0000000000010100

1 000001000100000

0000001110001000

1 111001111000000

0000000000010100

1 000001000000000

0000000000100010

1 000001000000000

0000000000100010

1 000001000000000

COM8

COM9

COM10

COM11

COM12

COM13

COM14

COM15

COM24

COM25

COM26

COM27

COM28

COM29

COM30

COM31

0000000000000000

0 000000000000000 MSB

LCD display map

When selecting 3 page

COM16

When selecting 0 page

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