參數(shù)資料
型號: EM73492
廠商: ELAN Microelctronics Corp .
英文描述: 4-Bit Micro-Controller for Telecom Product(用于通訊產(chǎn)品和家用電器,工作電壓為2.2V-5.5V的4位微控制器)
中文描述: 4位微控制器的電信產(chǎn)品(用于通訊產(chǎn)品和家用電器,工作電壓為2.2伏至5.5V的4位微控制器)
文件頁數(shù): 7/44頁
文件大?。?/td> 231K
代理商: EM73492
EM73492
4-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
7
* This specification are subject to be changed without notice.
7.17.1998
Indirect addressing mode indicates the RAM address by specified HL register .
For example:
LDAM ; Acc
RAM[HL]
STAM ; RAM[HL]
Acc
(2) Direct addressing mode:
Direct addressing mode indicates the RAM address by immediate data .
For example:
LDA x ; Acc
RAM[x]
STA x ; RAM[x]
Acc
(3) Zero-page addressing mode
For zero-page region, user can using direct addressing to write or do any arithematic, comparsion or bit
manupulated operation directly.
For example:
STD #k,y ; RAM[y]
#k
ADD #k,y; RAM[y]
RAM[y] + #k
PROGRAM COUNTER (4K ROM)
Program counter ( PC ) is composed by a 12-bit counter, which indicates the next executed address for the
instruction of program ROM.
For a 4K - byte size ROM, PC can indicate address form 000h - FFFh, for BRANCH and CALL instrcutions,
PC is changed by instruction indicating.
(1) Branch instruction:
SBR a
Object code: 00aa aaaa
Condition: SF=1; PC
PC
11-6.a
( branch condition satisified )
PC
Hold original PC value+1
a
a
a
a
a
a
SF=0; PC
PC +1( branch condition not satisified)
PC Original PC value + 1
LBR a
Object code: 1100 aaaa aaaa aaaa
Condition: SF=1; PC
a ( branch condition satisified)
PC a
a
a
a
a
a
a
a
a
a
a
a
SF=0 ; PC
PC + 2 ( branch condition not satisified )
PC
Original PC value + 2
(2) Subroutine instruction:
SCALL a
Object code: 1110 nnnn
Condition : PC
a ; a=8n+6 ; n=1..15 ; a=86h, n=0
PC 0
0
0
0
a
a
a
a
a
a
a
a
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