EM78871H Ver la hoja de datos (PDF) - ELAN Microelectronics

Número de pieza

componentes Descripción

Fabricante

EM78871H

8-BIT MICRO-CONTROLLER

ELAN Microelectronics 

One instruction

EM78871

8-bit Micro-controller

R EG IS T E R

STROBE

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

IOC7(0) IOC7(1) IOC7(2) IOC7(3) IOC7(4) IOC7(5) IOC7(6) IOC7(7) IOC8(0) IOC8(1) IOC8(2) IOC8(3) IOC8(4) IOC8(5) IOC8(6) IOC8(7)

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

Fig.14 key strobe signal

Bit 6(KEYCHK) : Key check enable control bit

0 disable key check function.

1 enable key check function. SEG8 to SEG23 will keep low level.

Figure 15 is relationship between KEYSCAN, KEYSTROBE , KETCHECK and segments.

And figure 16 is key scan flow by interrupt trigger.

RELATION BETWEEN S(8:23) , KEYSCAN, KEY STROBE, KEY CHECK

KEY SCAN PULSE

KEY SCAN

CONTROL

SEGMENT(8:23)

KEY STROBE SIGNAL

0

MUX

0

GND

MUX

1

1

KEYSTROBE

KEYCHECK

Fig.15 KEYSCAN, KEYSTROBE , KEYCHECK and segments.

Bit 7(CAS) : CALL WAITING decoding output

0/1 CW data valid / No data

__________________________________________________________________________________________________________________________________________________________________

* This specification is subject to be changed without notice. 26

8/23/04 (V1.5)

Share Link: