EM78911 datasheet(12/37 Pages) EMC

12 / 37 page

EM78911

-bit micro

bit micro

bit micro-

-controller

controller

3. IOC5 (I/O Port Control Register)

IOC57

IOC56

IOC55

IOC54

P5S

* Bit0: P5S is switch register for I/O port or LCD signal switching.

0/1= normal I/O port/SEGMENT output .

* Bit1~3: unused

* Bit 4 to Bit7 are PORT5 I/O direction control registers.

"1" put the relative I/O pin into high impedance, while "0" put the relative I/O pin as output.

4. IOC6 ~ IOC9 (I/O Port Control Register)

four I/O direction control registers.

"1" put the relative I/O pin into high impedance, while "0" put the relative I/O pin as output.

User can see IOCB register how to switch to normal I/O port.

IOCA (CALLER ID RAM,IO ,PAGE Control Register)(read/write,initial "00000000")

P8SH

P8SL

CALL_4 CALL_3 CALL_2 CALL_1 RANGE

Bit0 : register to control low power detection range .

0/1=3.2V/3.6V

Bit4~Bit1:"000" to "1001"

are ten blocks of CALLER ID RAM area. User can use 2.5K RAM with RD

ram address.

Bit 5 unused

Bit6: port8 low nibble switch, 0/1= normal I/O port/SEGMENT output .

Bit7: port8 high nibble switch , 0/1= normal I/O port/SEGMENT output

6. IOCB (LCD ADDRESS)

PAGE0 : Bit6 ~ Bit0 = LCDA6 ~ LCDA0

The LCD display data is stored in the data RAM . The relation of data area and COM/SEG pin is as below:

COM15 ~ COM8

COM7 ~ COM0

40H (Bit15 ~ Bit8)

00H (Bit7 ~ Bit0)

SEG0

41H

01H

SEG1

7AH

4AH

SEG58

7BH

3BH

SEG59

7CH

3CH

Empty

7FH

3FH

Empty

PAGE1 : 8 bit up-counter (COUNTER1) preset and

read out register . ( write = preset ) . After a

interruption , it will count from “00”.

EM78911 Datasheet(PDF) 12 Page - ELAN Microelectronics Corp

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