EM78P5840NM Ver la hoja de datos (PDF) - ELAN Microelectronics

Número de pieza

componentes Descripción

Fabricante

EM78P5840NM

8-Bit Microcontrollers

ELAN Microelectronics 

EM78P5840N/41N/42N

8-Bit Microcontrollers

7.2.2 R1 (TCC)

The TCC data buffer is Increased by 16.384kHz or by the instruction clock cycle

(controlled by the CONT register). It is written and read by the program as with any

other register.

7.2.3 R2 (Program Counter)

The R2 structure is depicted in the Figure 7-1 below. The configuration structure

generates 4K × 13 external ROM addresses to the corresponding program instruction

codes.

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

The "CALL" instruction loads the low 10 bits of the PC, PC+1, and then pushes the data

onto 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

contents of the ninth and tenth bits are cleared to "0.''

"ADD R2,A" allows a relative address to be added to the current PC, and the contents

of the ninth and tenth bits are cleared to "0.''

"TBL" allows a relative address to be added to the current PC, and the contents of the

ninth and tenth bits don't change. The most significant bit (A10~A11) will be loaded

with the contents of bits PS0~PS1 in the status register (R5 Page 0) upon execution of

a "JMP'', "CALL'', "ADD R2, A'', or "MOV R2, A'' instruction.

If an interrupt is triggered, the program ROM will jump to Address 0x08 at Page 0. The

CPU will store ACC, the status of R3, and R5 Page automatically; and they will be

restored after instruction RETI.

R5 (Page)

A11 A10 A9 A8 A7~A0

CALL

and

Interrupt

0

0

Page 0 00000~003FF

RET

RETL

RETI

0

1

Page 1 00400~007FF

1

0

Page 2 00800~00BFF

1

1

Page 3 00C00~00FFF

Stack 1

Stack 2

Stack 3

Stack 4

Stack 5

Stack 6

Stack 7

Stack 8

store

ACC, R3, R5 (Page)

restore

Figure 7-1 Program Counter Organization

8•

Product Specification (V1.0) 04.25.2006

(This specification is subject to change without further notice)

Share Link: