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S1C63466 TECHNICAL MANUAL EPSON 47

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)

4.7 LCD Driver (COM0–COM16, SEG0–SEG59)

4.7.1 Configuration of LCD driver

The S1C63466 has 17 common terminals (COM0–COM16) and 60 segment terminals (SEG0–SEG59), so

that it can drive a dot matrix type LCD with a maximum of 1,020 (60 × 17) dots.

The driving method is 1/17 duty, 1/16 duty or 1/8 duty dynamic drive with four voltages (1/4 bias),

C1, VC2, VC4 and VC5 (1/5 bias driving can be set by impressing five voltages from outside).

LCD display ON/OFF can be controlled by the software.

4.7.2 Power supply for LCD driving

VC1–VC5 are driving voltages for the LCD, and for which either the voltages generated by the LCD

system voltage circuit or voltages to be supplied from outside can be used. The built-in LCD system

voltage circuit generates four voltages (1/4 bias) V

C1, VC2, VC4 and VC5 except for VC3. These four output

voltages can be supplied to the outside only for driving the externally expanded LCD driver.

When external voltages are supplied, 1/5 bias driving can be made by inputting five voltages to the V

C1–

C5 terminals (including VC3).

Either the internal generated voltages or external voltages used for the LCD drive voltage can be selected

by the mask option.

Turning the LCD system voltage circuit ON or OFF is controlled with the LPWR register. This control is

also necessary when supplying the voltage from outside. When LPWR is set to "1", the LCD system

voltage circuit outputs the LCD drive voltages V

C1–VC5 to the LCD driver.

When "internal voltage" is selected by the mask option, the LCD system voltage circuit generates V

C1 or

C2 with the voltage regulator incorporated in itself, and generates three other voltages by boosting or

reducing the voltage V

C1 or VC2. Table 4.7.2.1 shows the VC1, VC2, VC4 and VC5 voltage values and boost/

reduce status.

Table 4.7.2.1 LCD drive voltage when generated internally

LCD drive voltage

(0.975–1.2 V)

(1.950–2.4 V)

(2.925–3.6 V)

(3.900–4.8 V)

= 1.8–6.4 V

(standard)

2 × V

3 × V

4 × V

= 2.6–6.4 V

1/2 × V

(standard)

3/2 × V

2 × V

Note: The LCD drive voltage can be adjusted by the software (see Section 4.7.6). Values in the table are

typical values.

Select either VC1 standard or VC2 standard using the VCCHG register.

When "1" is written to the VCCHG register, V

C2 standard is selected and when "0" is written, VC1 stan-

dard is selected. At initial reset, V

C1 standard (VCCHG = "0") is set.

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