EM78869 データシートの表示（PDF） - ELAN Microelectronics

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EM78869

8-Bit RISC Type Microprocessor

ELAN Microelectronics 

EM78869

8-Bit RISC Type Microprocessor

Bit 5:

Bit 6:

Bit 7:

Unused, fixed at “0”

(PAGE) Change IOCB ~ IOCE to another page, 0/1 => page0 / page1

Unused

6.1.5 R4 (Register Bank Select Register)

Bit 7

RBK1

Bit 6

RBK0

Bit 5

FSR5

Bit 4

FSR4

Bit 3

FSR3

Bit 2

FSR2

Bit 1

FSR1

Bit 0

FSR0

Bits 0 ~ 5: Used to select up to 32 registers in indirect address mode of each bank

Bits 6 ~ 7: Determine which bank is activated among the 4 banks

Refer to Fig. 4; Data Memory Configuration (previous page) for configuration of the data

memory

6.1.6 R5 (Program Page Select Register)

Bit 7

R57

Bit 0 ~2:

Bit 6

R56

Bit 5

R55

Bit 4

R54

Bit 3

0

Bit 2

PS2

(PS0 ~ PS2) Page select bits as shown below:

Bit 1

PS1

Bit 0

PS0

Bit 3:

Bit 4 ~7:

PS2 PS1 PS0 Program Memory Page (Address)

0

0

0

Page 0

0

0

1

Page 1

0

1

0

Page 2

:

:

1

1

0

Page 6

1

1

1

Page 7

You can use PAGE instruction to change and maintain program page. Otherwise,

use far jump (FJMP) or far call (FCALL) MACRO instructions to program user's

code. ÉLAN’s complier supports program page maintenance and can change

your program by inserting instructions within its program.

Unused. Set to ‘0’

4-bit I/O registers of Port 5

6.1.7 R6 (Port 6)

Bit 7

-

Bit 0:

Bit 6

-

Bit 5

-

Bit 4

-

Port 6 single bit (Bit 0) I/O register

Bit 3

-

Bit 1 ~7: Unused

Bit 2

-

Bit 1

-

Bit 0

R60

6.1.8 R7 (Port 7)

Bit 7

R77

Bit 6

R76

Bit 5

R75

Bit 4

R74

Bit 0 ~7: Port 7 8-bit I/O registers

Bit 3

R73

Bit 2

R72

Bit 1

R71

Bit 0

R70

This specification is subject to change without further notice.

07.12.2004 (V1.0) 7 of 34

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