SN8F27E64LKB datasheet(34/192 Pages) SONIX

34 / 192 page

SN8F27E60 Series

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

SONiX TECHNOLOGY CO., LTD

Page 34

Version 1.4

2.2.5 H, L REGISTERS

The H and L registers are the 8-bit buffers. There are two major functions of these registers.



Can be used as general working registers



Can be used as RAM data pointers with @HL register

081H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

HBIT7

HBIT6

HBIT5

HBIT4

HBIT3

HBIT2

HBIT1

HBIT0

Read/Write

R/W

After reset

080H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

LBIT7

LBIT6

LBIT5

LBIT4

LBIT3

LBIT2

LBIT1

LBIT0

Read/Write

R/W

After reset

Example: If want to read a data from RAM address 20H of bank_0, it can use indirectly addressing mode to

access data as following.

B0MOV

H, #00H

; To set RAM bank 0 for H register

B0MOV

L, #20H

; To set location 20H for L register

B0MOV

A, @HL

; To read a data into ACC

Example: Clear general-purpose data memory area of bank 0 using @HL register.

CLR

; H = 0, bank 0

B0MOV

L, #07FH

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

CLR_HL_BUF:

CLR

@HL

; Clear @HL to be zero

DECMS

; L

– 1, if L = 0, finish the routine

JMP

CLR_HL_BUF

; Not zero

CLR

@HL

END_CLR:

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

…

SN8F27E64LKB Datasheet(PDF) 34 Page - SONiX Technology Company

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