Samsung KS57C2308 Manual page 41

KS57C2308/P2308/C2316/P2316
8-BIT ADDRESSING
Instruction
Notation
DA Direct: 8-bit address indicated
by the RAM address (DA =
even number) and memory
bank selection
@HL Indirect: the 8-bit address indi-
cated by the memory bank
selection and register HL; (the
4-bit L register value must be
an even number)
+ +
PROGRAMMING TIP — 8-Bit Addressing Modes
8-Bit Direct Addressing
1. If EMB = "0":
ADATA EQU
BDATA EQU
SMB
LD
SMB
LD
LD
2. If EMB = "1":
ADATA EQU
BDATA EQU
SMB
LD
SMB
LD
LD
Table 3-4. 8-Bit Direct and Indirect RAM Addressing
Addressing Mode
Description
46H
8EH
15
EA,P4
0
ADATA,EA
BDATA,EA
46H
8EH
15
EA,P4
0
ADATA,EA
BDATA,EA
EMB Flag Addressable
Setting Area
000H–07FH
0 F80H–FFFH
1 000H–FFFH
0 000H–0FFH
1 000H–FFFH
; Non-essential instruction, since EMB = "0"
; E (P5), A
; (046H) A, (047H)
; (F8EH) A, (F8FH)
; E (P5), A
; (046H) A, (047H)
; (08EH) A, (08FH)
ADDRESSING MODES
Memory
Bank
Bank 0
Bank 15 All 8-bit
addressable
peripherals
SMB = 0, 1, (SMB = 15)
15
Bank 0
SMB = 0, 1, All 8-bit
15 addressable
peripherals
(SMB = 15)
(P4)
E
E
(P4)
E
E
Hardware I/O
Mapping
–
–
3-11