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EM73866 Fiches technique(PDF) 7 Page - ELAN Microelectronics Corp

No de pièce EM73866
Description  4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
PDF  39 Pages
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Fabricant  EMC [ELAN Microelectronics Corp]
Site Internet  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM73866 Fiches technique(HTML) 7 Page - ELAN Microelectronics Corp

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* This specification are subject to be changed without notice.
EM73866
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
12.29.1999
P9.3
instruction field
RAM address
xxxx xxxx
xxxx xxxx
0
instruction field
RAM address
yyyy
0000 yyyy
PROGRAM EXAMPLE: Load the data of RAM address "143h" to RAM address "023h".
SEP
P9,3
; P9.3← 1
LDA
43h
; Acc← RAM[143h]
CLP
P9,3
; P9.3← 0
STA
23h
; RAM[023h]← Acc
(3) Zero-page addressing mode:
The address is the lower 4 bits code of the second byte in the instruction field.This kind of instructions are
only available for the zero page. Area in bank0, even the P9.3 is set.
PROGRAM EXAMPLE: Write immediate "0Fh" to RAM address "005h".
STD
#0Fh, 05h
; RAM[05h]← 0Fh
The bank is selected by P9.3. When P9.3 is cleared to "0", the bank 0 is selected. When P9.3 is set to "1", the bank
1 is selected.
There are 3 addressing mode to access the data memory, namely -
(1) Indirect addressing mode:
The address in the certain bank is specified by the HL registers.
PROGRAM EXAMPLE: Load the data of RAM address "143h" to RAM address "032h".
SEP
P9,3
; P9.3← 1
LDL
#3h
; LR← 3
LDH
#4h
; HR← 4
LDAM
; Acc← RAM[143h]
CLP
P9,3
; P9.3← 0
LDL
#2h
; LR← 2
LDH
#3h
; HR← 3
STAM
; RAM[032h]← Acc
(2) Direct addressing mode:
The address in the bank is directly specified by 8 bits code of the second byte in the instruction field.
P9.3
HR
LR
RAM address



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