EM78P860

8 -BIT MICRO-CONTROLLER

* This specification is subject to be changed without notice.

4.17.2000

6

5.

R4 ( RAM Select Register )

• Bit 0 ~ 5 are used to select up to 64 register in the indirect addressing mode.

• Bit 6 ~ 7 determine which bank is actived among the 4 banks.

• See the configuration of the data memory in Fig. 4.

6.

R5 ( Program Page Select Register)

76

5

432

1

0

-

-

-

-

PS3

PS2

PS1

PS0

• Bit 0 (pS0) ~ 3 (PS3) Page selec bits.

Page select bits

PS3

PS2

PS1

PS0

program memory page (Address)

0000

Page 0

0001

Page 1

0010

Page 2

0011

Page 3

0100

Page 4

0101

page 5

0110

Page 6

0111

Page 7

1000

Page 8

1001

Page 9

1010

Page 10

1011

Page 11

1100

Page 12

1101

Page 13

1110

Page 14

1111

Page 15

• 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 instruction within program.

• Bit4~7 : unused

7.

R6 ~R9 ( Port 6 ~ Port 9)

• Five 8-bit I/O registers.

8.

RA

76

5

432

1

0

IDLE

/358E

/LPD

/LOW-BAT

0

0

0

0

• Bit0 ~ Bit3 unused, please set to "0"