EM78811 데이터 시트보기 (PDF) - ELAN Microelectronics

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EM78811

8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT

ELAN Microelectronics 

EM78811

8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT

R2 (Program Counter)

* The structure is depicted in Fig. 4.

* Generates 16Kx13 ( 14 on-chip ROM addresses to the relative programming instruction codes.

* "JMP" instruction allows the direct loading of the low 10 program counter bits.

* "CALL" instruction loads the low 10 bits of the PC, PC+1, and then push into the stack.

* "RET'' ("RETL k", "RETI") instruction loads the program counter with the contents at the top of stack.

* "MOV R2,A" allows the loading of an address from the A register to the PC, and the ninth and tenth bits

are cleared to "0''.

* "ADD R2,A" allows a relative address be added to the current PC, and contents of the ninth and tenth bits

are cleared to "0''.

* "TBL" allows a relative address be added to the current PC, and contents of the ninth and tenth bits don't

change. The most significant bit (A10~A13) will be loaded with the content of bit PS0~PS3 in the status

register (R5) upon the execution of a "JMP'', "CALL'', "ADD R2,A'', or "MOV R2,A'' instruction.

PC A13 A12 A11 A10 A9 A8

A7~A0

CALL

RET

RETL

RETI

1000 2000 Page 8

1001

23FF

2400

Page 9

1010

27FF

2800 Page 10

1011

2CFF

2D00 Page 11

2FFF

1100 3000 Page 12

33FF

1101 3400 Page 13

1110

37FF

3800 Page 14

3CFF

1111 3D00 Page 15

3FFF

0000 0000 Page 0

0001

03FF

0400

Page 1

0010

07FF

0800 Page 2

0011

0CFF

0D00 Page 3

0FFF

0100 1000 Page 4

13FF

0101 1400 Page 5

0110

17FF

1800 Page 6

1CFF

0111 1D00 Page 7

1FFF

Stack 1

Stack 2

Stack 3

Stack 4

Stack 5

Stack 6

Stack 7

Stack 8

Fig.4 Program counter organization

* This specification are subject to be changed without notice.

10.12.1998 5

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