SN8P1602AX datasheet(25/94 Pages) SONIX

25 / 94 page

SN8P1600

8-bit micro-controller

SONiX TECHNOLOGY CO., LTD

Page 25

Revision 1.94

WORKING REGISTERS

The RAM bank0 locations 82H to 84H store the specially defined registers such as register R, Y, Z, respectively shown

in the following table. These registers can use as the general-purpose working buffer or access ROM’s and RAM’s

data. For instance, all of the ROM table can be looked-up by R, Y and Z registers. The data of RAM memory can be

indirectly accessed with Y and Z registers.

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 address ROM location to look up ROM data.

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

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

addressing RAM location to read/write data through ACC. The Lower 4-bit of Y register points to RAM bank number

and Z register to RAM address number, respectively. The higher 4-bit data of Y register is truncated in RAM indirectly

access mode.

Example: Following example uses indirectly addressing mode 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: Clear general-purpose data memory area of bank 0 using @YZ register.

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

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

SN8P1602AX Datenblatt(PDF) 25 Page - SONiX Technology Company

SN8P1602AX Datenblatt(HTML) 25 Page - SONiX Technology Company

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94

Datenblatt Download

Link URL