SN8F27E64LKB datasheet(20/192 Pages) SONIX

20 / 192 page

SN8F27E60 Series

8-Bit Flash Micro-Controller with Embedded ICE and ISP

SONiX TECHNOLOGY CO., LTD

Page 20

Version 1.4

2.1.3 LOOK-UP TABLE DESCRIPTION

In the ROM’s data lookup function, Y register is pointed to middle byte address (bit 8~bit 15) and Z register is pointed

to low byte address (bit 0~bit 7) of ROM. After MOVC instruction executed, the low-byte data will be stored in ACC and

high-byte data stored in R register.



Example: To look up the ROM data located “TABLE1”.

B0MOV

Y, #TABLE1$M

; To set lookup table1’s middle address

B0MOV

Z, #TABLE1$L

; To set lookup table1’s low address.

MOVC

; To lookup data, R = 00H, ACC = 35H

; Increment the index address for next address.

INCMS

; Z+1

JMP

; Z is not overflow.

INCMS

; Z overflow (FFH  00),  Y=Y+1

NOP

;

@@:

MOVC

; To lookup data, R = 51H, ACC = 05H.

…

;

TABLE1:

0035H

; To define a word (16 bits) data.

5105H

2012H

…



Note: The Y register will not increase automatically when Z register crosses boundary from 0xFF to

0x00. Therefore, user must take care such situation to avoid look-up table errors. If Z register is

overflow, Y register must be added one. The following INC_YZ macro shows a simple method to process

Y and Z registers automatically.



Example: INC_YZ macro.

INC_YZ

MACRO

INCMS

; Z+1

JMP

; Not overflow

INCMS

; Y+1

NOP

; Not overflow

@@:

ENDM

SN8F27E64LKB Datasheet(PDF) 20 Page - SONiX Technology Company

SN8F27E64LKB Datasheet(HTML) 20 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 95 96 97 98 99 100 ...More

Datasheet Download

Link URL