參數(shù)資料
型號(hào)： EM73290
廠商： ELAN Microelctronics Corp .
英文描述： 4-Bit Micro-Controller for General-Purpose Product(用于家用電器，消費(fèi)類產(chǎn)品和玩具控制器，工作電壓4.5V-5.5V的單片4位微控制器)
中文描述： 4位微控制器一般通用產(chǎn)品（用于家用電器，消費(fèi)類產(chǎn)品和玩具控制器，工作電壓4.5V時(shí)至5.5V的單片4位微控制器）
文件頁(yè)數(shù)： 6/32頁(yè)
文件大小： 165K
代理商： EM73290
6
* This specification are subject to be changed without notice.
7.17.1998
EM73290
4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT
DATA RAM ( 116-nibble )
There is total 116 - nibble data RAM from address 00 to 73h
Data RAM includes 3 parts: zero page region, stacks and data area.
ZERO- PAGE:
From 00h to 0Fh is the location of zero-page . It is used as the pointer in zero -page addressing mode for the
instruction of "STD #k,y; ADD #k,y; CLR y,b; CMP y,b".
PROGRAM EXAMPLE: To wirte immediate data "07h" to address "03h" of RAM and to clear bit 2 of RAM.
STD #07h, 03h ; RAM[03]
←
07h
CLR 0Eh,2 ; RAM[0Eh]
2
←
0
STACK:
There are 13 - level ( maximum ) stack for user using for subroutine ( including interrupt and CALL). User
can assign any level be the starting stack by giving the level number to stack pointer( SP) .
When user using any instruction of CALL or subroutine, before entry the subroutine, the previous PC address
will be saved into stack until return from those subroutines ,the PC value will be restored by the data saved
in stack.
DATA AREA:
Except the special area used by user, the whole RAM can be used as data area for storing and loading general
data.
ADDRESSING MODE
(1) Indirect addressing mode:
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 .
Increment
Address
50h - 5Fh
60h - 6Fh
70h - 73h
Level 0
Level 4
Level 8
Level 12
Level 1
Level 5
Level 9
Level 2
Level 6
Level 10
Level 3
Level 7
Level 11
I
Zero-page
00h - 0Fh
10h - 1Fh
.
.
.
.
.
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