EM78P813

8-bit OTP Micro-controller

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* This specification is subject to change without notice.

45

2004/8/19

(V1.6)

PAGE1 Port B IO/SEG Control Register

7

6

5

4

3

2

1

0

PBS7

PBS6

PBS5

PBS4

PBS3

PBS2

PBS1

PBS0

Bit 0~Bit 7 (PBS0~PBS7) : Switch I/O PORTB or LCD segment(com) output for share pins COMxx/SEGxx/PORTB

pins

0

select normal PORTB I/O

1

select output for LCD COM/SEGMENT output.

IOCA Stack point , Port C IO/SEG Control

PAGE0 STACK Point

7

6

5

4

3

2

1

0

-

-

-

STKP4

STKP3

STKP2

STKP1

STKP0

Bit 0 ~ Bit 5 (STKP0 ~ STKP4) : Stack Point selection bits

Stack4

STKP3

STKP2

STKP1

STKP0 Stack Point

0

0

0

0

0

Stack 1

0

0

0

0

1

Stack 2

0

0

0

1

0

Stack 3

0

0

0

1

1

Stack 4

:

:

:

:

:

:

:

:

:

:

:

:

1

0

1

1

0

Stack 22

1

0

1

1

1

Stack 23

1

1

0

0

0

Stack 24

User can read bit 5 .. bit 0 to understand how many stack layer that program used . Bit 4 .. bit 0 is a six bit

counter. The counter will incrementally after user use internal , external interrupt or “CALL” instruction and it will

decrement when user use “RET” or “RETI” instruction. These five bits are read only bits.

Bit 5~Bit 7 : Unused

PAGE1 Port C IO/SEG Control Register

7

6

5

4

3

2

1

0

PCS7

PCS6

PCS5

PCS4

PCS3

PCS2

PCS1

PCS0

Bit 0~Bit 7 (PCS0~PCS7) : Switch I/O PORTC or LCD segment(com) output for share pins COMxx/SEGxx/PORTC

pins

0

select normal PORTC I/O

1

select output for LCD COM/SEGMENT output.

IOCB PORT B I/O Control ,External LCD driver interface (for EMC 65x132)

PAGE0 PORT B I/O Control

7

6

5

4

3

2

1

0

IOCB7

IOCB6

IOCB5

IOCB4

IOCB3

IOCB2

IOCB1

IOCB0

Bit 0~Bit 7 (IOCB0~IOCB7) : PORTB(0~7) I/O direction control register

0

put the relative I/O pin as output

1

put the relative I/O pin into high impedance

PAGE1 External LCD Driver controller

7

6

5

4

3

2

1

0

EXA17

CWPWR

RES1

RSE0

CSS

CSSON

DIS

EXLCD

Bit 0(EXLCD) : Internal/External LCD driver switch.

0/1

Internal only/Internal and External LCD driver control