EM78871AQ Ver la hoja de datos (PDF) - ELAN Microelectronics

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componentes Descripción

Fabricante

EM78871AQ

8-BIT MICRO-CONTROLLER

ELAN Microelectronics 

SCK

(SCES=0)

SCK

(SCES=1)

SDO

SDI

RBF

EM78871

8-bit Micro-controller

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

Shift data in

Shift data out

Fig.8 SPI timing

Clear by software

R5 (PORT5 I/O data, Program page selection, SPI data)

PAGE0 (PORT5 I/O data register, Program page register)

7

6

5

4

3

2

1

0

R57

R56

R55

PS4

PS3

PS2

PS1

PS0

Bit 0 ~ Bit 4 (PS0 ~ PS4) : Program page selection bits

PS4 PS3 PS2 PS1 PS0 Program memory page (Address)

0 0 0 0 0 Page 0

0 0 0 0 1 Page 1

0 0 0 1 0 Page 2

0 0 0 1 1 Page 3

: : : : ::

: : : : ::

1 1 1 1 0 Page 30

1 1 1 1 1 Page 31

User can use PAGE instruction to change page to maintain program page by user. Otherwise, user can use far jump

(FJMP) or far call (FCALL) instructions to program user's code. And the program page is maintained by EMC's

complier. It will change user's program by inserting instructions within program.

Bit 5 ~ Bit 6(P55 ~ P57) : 3-bit PORT5(5~7) I/O data register

User can use IOC register to define input or output each bit.

__________________________________________________________________________________________________________________________________________________________________

* This specification is subject to be changed without notice. 16

8/23/04 (V1.5)

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