SN8A1702AX datasheet(37/145 Pages) SONIX

37 / 145 page

SN8P1700

8-bit micro-controller build-in 12-bit ADC

SONiX TECHNOLOGY CO., LTD

Page 37

Revision 1.94

Y, Z REGISTERS

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

can be used as working registers. Second, these two registers can be used as data pointers for @YZ register. Third,

the registers can be address ROM location in order to look-up ROM data.

Y initial value = 0000 0000

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

R/W

Z initial value = 0000 0000

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

R/W

The @YZ that is data point_1 index buffer located at address E7H in RAM bank 0. It employs Y and Z registers to

addressing RAM location in order to read/write data through ACC. The Lower 4-bit of Y register is pointed to RAM

bank number and Z register is pointed to RAM address number, respectively. The higher 4-bit data of Y register is

truncated in RAM indirectly access mode.

Example: If want to read a data from RAM address 25H of bank 1, it can use indirectly addressing mode to

access data as following.

B0MOV

Y, #01H

; To set RAM bank 1 for Y register

B0MOV

Z, #25H

; To set location 25H for Z register

B0MOV

A, @YZ

; To read a data into ACC

Example: Clear general-purpose data memory area of bank 1 using @YZ register.

MOV

A, #1

B0MOV

Y, A

; Y = 1, bank 1

MOV

A, #07FH

B0MOV

Z, A

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

CLR_YZ_BUF:

CLR

@YZ

; Clear @YZ to be zero

DECMS

; Y – 1, if Y= 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

Note: Please consult the “LOOK-UP TABLE DESCRIPTION” about Y, Z register look-up table application.

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