SMBP2501BPB datasheet(30/107 Pages) SONIX

30 / 107 page

SN8P2501B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 30

Version 2.1

2.1.4.7

Y, Z REGISTERS

The Y and Z registers are the 8-bit buffers. There are three major functions of these registers.



can be used as general working registers



can be used as RAM data pointers with @YZ register



can be used as ROM data pointer with the MOVC instruction for look-up table

084H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

YBIT7

YBIT6

YBIT5

YBIT4

YBIT3

YBIT2

YBIT1

YBIT0

Read/Write

R/W

After reset

083H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

ZBIT7

ZBIT6

ZBIT5

ZBIT4

ZBIT3

ZBIT2

ZBIT1

ZBIT0

Read/Write

R/W

After reset



Example:

Uses Y, Z register as the data pointer to access data in the RAM address 025H of bank0.

B0MOV

Y, #00H

; To set RAM bank 0 for Y register

B0MOV

Z, #25H

; To set location 25H for Z register

B0MOV

A, @YZ

; To read a data into ACC



Example:

Uses the Y, Z register as data pointer to clear the RAM data.

B0MOV

Y, #0

; Y = 0, bank 0

B0MOV

Z, #07FH

; Z = 7FH, the last address of the data memory area

CLR_YZ_BUF:

CLR

@YZ

; Clear @YZ to be zero

DECMS

; Z

– 1, if Z= 0, finish the routine

JMP

CLR_YZ_BUF

; Not zero

CLR

@YZ

END_CLR:

; End of clear general purpose data memory area of bank 0

…

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