7513 datasheet(42/66 Pages) RENESAS

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

7513 Group

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).

When releasing from reset, the VCC (VL3) voltage is output from

the common pins.

Table 11 Duty ratio control and common pins used

Duty

ratio

Common pins used

Notes1: COM2 and COM3 are open.

2: COM3 is open.

Bit 1

Bit 0

COM0, COM1 (Note 1)

Duty ratio selection bit

COM0–COM2 (Note 2)

COM0–COM3

Segment Signal Output Pin

Segment signal output pins are classified into the segment-only

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

SEG25), and the segment/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 release, a VCC

(=VL3) voltage is output to the segment-only pins and the seg-

ment/output port pins are the high impedance condition. The seg-

ment/I/O port pins(SEG26–SEG33). are set to input ports, and the

high impedance condition.The segment/I/O port pins(SEG34–

SEG39). are set to input ports, and VCC (=VL3) is applied to them

by pull-up resistor.

LCD Display RAM

Address 004016 to 005316 is the designated RAM for the LCD dis-

play. When “1” 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 in-

ternally and the frame frequency can be determined with the

following equation;

f(LCDCK) =

Frame frequency =

Fig. 43 LCD display RAM map

(frequency of count source for LCDCK)

(divider division ratio for LCD)

f(LCDCK)

(duty ratio)

Bit

address

432

004016

004116

004216

004316

004416

004516

004616

SEG1

SEG3

SEG5

SEG7

SEG9

SEG0

SEG2

SEG4

SEG6

SEG8

SEG10

COM3 COM2 COM1 COM0

SEG12

SEG14

SEG16

SEG18

SEG20

SEG22

SEG24

SEG26

SEG28

SEG30

SEG32

SEG34

SEG36

SEG38

SEG21

SEG23

SEG25

SEG27

SEG11

SEG13

SEG15

SEG17

SEG19

SEG29

SEG31

SEG33

SEG35

SEG37

SEG39

004716

004816

004916

004A16

004B16

004C16

004D16

004E16

004F16

005016

005116

005216

005316

COM3 COM2 COM1 COM0

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