EM78P568

8-bit OTP Micro-controller

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* This specification are subject to be changed without notice.

22

01/31/2004

V4.7

Fig.6 Block diagram of TCC WDT

IOC5 (PORT5 I/O control, LCD bias control, Comparator control)

PAGE0 (LCD bias control bits)

7

6

5

4

3

2

1

0

IOC57

IOC56

IOC55

-

BIAS3

BIAS2

BIAS1

BIAS0

R/W-1

R/W-1

R/W-1

R/W-0

R/W-0

R/W-0

R/W-0

Bit 0 ~ Bit 3 (BIAS0 ~ BIAS3) : LCD operation voltage selection. V1 = VDD * (1 - n/60)

BIAS3

BIAS2

BIAS1

BIAS0

Vop (=VDD-VLCD)

Example (VDD = 3V)

0

0

0

0

VDD * (1-0/60)

3V

0

0

0

1

VDD * (1-1/60)

2.95V

0

0

1

0

VDD * (1-2/60)

2.90V

0

0

1

1

VDD * (1-3/60)

2.85V

0

1

0

0

VDD * (1-4/60)

2.80V

:

:

:

:

:

:

1

1

0

1

VDD * (1-13/60)

2.35V

1

1

1

0

VDD * (1-14/60)

2.30V

1

1

1

1

VDD * (1-15/60)

2.25V

Bit 4 : (undefined) not allowed to use

Bit 5 ~ Bit 7 (IOC55 ~ IOC57) : PORT5(5~7) I/O direction control register

0

put the relative I/O pin as output

1

put the relative I/O pin into high impedance

16.38KHz