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EM73963A Fiches technique(PDF) 7 Page - ELAN Microelectronics Corp

No de pièce EM73963A
Description  4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
PDF  38 Pages
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Fabricant  EMC [ELAN Microelectronics Corp]
Site Internet  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM73963A Fiches technique(HTML) 7 Page - ELAN Microelectronics Corp

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* This specification are subject to be changed without notice.
EM73963A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
6.14.2001
P9.3
instruction field
RAM address
xxxx xxxx
xxxx xxxx
0
instruction field
RAM address
yyyy
0000 yyyy
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.
The data Memory consists of three Address mode, namely -
(1) Indirect addressing mode:
The address in the bank is specified by the HL registers.
PROGRAM EXAMPLE: Load the data of RAM address "143h" to RAM address "023h".
SEP P9,3 ; P9.3← 1
LDL #3h ; LR← 3
LDH #4h ; HR← 4
LDAM
; Acc← RAM[134h]
CLP P9,3 ; P9.3← 0
LDL #2h ; LR← 2
LDH #3h ; HR← 3
STAM
; RAM[023h]← Acc
(2) Direct addressing mode:
The address in the bank is directly specified by 8 bits of the second byte in the instruction field.
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 zero-page is in the bank 0 (address 000h~00Fh). The address is the lower 4 bits of the second byte in the
instruction field.
PROGRAM EXAMPLE: Write immediate "0Fh" to RAM address "005h".
STD #0Fh, 05h ; RAM[05h]← 0Fh
P9.3
HR
LR
RAM address



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