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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)： | 12/44頁 |
| 文件大?。?/td> | 231K |
| 代理商： | EM73492 |
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EM73492
4-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
* This specification are subject to be changed without notice.
7.17.1998
HL REGISTER FUNCTION
(1)For instruction : LDL #k, LDH #k, THA, THL, INCL, DECL, EXAL, EXAH, HL register used as a
temporary register .
PROGRAM EXAMPLE:
Load immediate data "5h" into L register, "Dh" into H register.
LDL #05h;
LDH #0Dh;
(2) For instruction LDAM, STAM, STAMI .., HL register used as a pointer for the address of RAM memory.
PROGRAM EXAMPLE: Store immediate data #Ah into RAM of address 35h.
LDL #5h;
LDH #3h;
STDMI #0Ah; RAM[35]
←
Ah
(3) For instruction : SELP, CLPL, TFPL, L regieter be a pointer to indicate the bit of I/O port.
When LR = 0 - 3, indicate P4.0 - P4.3.
LR = 4 - 7, indicate P5.0 - P5.3
LR = 8 - B, indicate P6.0 - P6.3
LR = C - F, indicate P7.0 - P7.3
PROGRAM EXAMPLE: To set bit 2 of Port6 to "1"
LDL #0Ah;
SEPL ; P6.2
←
1
STACK POINTER (SP)
Stack pointer is a 4-bit register which stores the present stack level number.
Before using stack, user must set the SP value first, CPU will not initiate the SP value after reset condition
. When a new subroutine is accepted, the SP will be decreased one automatically, in another word, if
returning from a subroutine, the SP will be increased one .
The data transfer between ACC and SP is by instruction of "LDASP" and "STASP".
DATA POINTER (DP)
Data pointer is a 12-bit register which stores the address of ROM can indicate the ROM code data
specified by user (refer to data ROM).
CLOCK AND TIMING GENERATOR
The clock generator is supported by a single clock system, the clock source comes from crystal (resonator),the
working frequency range is 480 K Hz to 4 MHz depending on the working voltage.
CLOCK AND TIMING GENERATOR STRUCTURE
The clock generator connects outside compoments ( crystal or resonator by XIN and XOUT pin for crystal
osc type) the clock generator generates a basic system clock "fc".
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