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參數(shù)資料
| 型號(hào)： | EM73400 |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | 4-Bit Micro-Controller for General-Purpose Product(用于通訊產(chǎn)品，家用電器，消費(fèi)類產(chǎn)品的工作電壓4.5-5.5V的4位微控制器) |
| 中文描述： | 4位微控制器一般通用產(chǎn)品（用于通訊產(chǎn)品，家用電器，消費(fèi)類產(chǎn)品的工作電壓4.5 - 5.5V的的4位微控制器） |
| 文件頁數(shù)： | 20/38頁 |
| 文件大小： | 197K |
| 代理商： | EM73400 |
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* This specification are subject to be changed without notice.
6.11.1998
EM73400
4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT
Since SIO function can transfer 4-bit data serially each time, there is a 4-bit buffer for the data to transfer or
receive, the SIO port is shared with PORT9 : P9.0/SI, it is a SIO data input pin for the SIO receive mode . P9.1/
SO, it is a SIO data output pin for the SIO transmit mode. P9.2/SCK is the serial clock pin, it could be internal
clock or external clock for both transmit or receive mode . SIO function also can generate interrupt request when
the 4-bit data buffer is full ( receive mode ) or empty (transmit mode ) .
The basic structure of SIO interface is as below, the transmit or receive mode is controlled by the command
port ( PORT 31 ), and the SIO status port is Port 14, user can check the SIO status from this port, PORT 15
is the 4-bit SIO buffer, in transmit mode, user put the transfer data in this buffer, then the SIO control will put
the data into the shift register and according the SCK to send data out to P9.1/SO, In another way, for receive
mode, the outside system will send data from P9.0/SI to shift register, then put data into buffer after 4-bit data
transfer ending .
PORT31 is the command port of SIO, user can set the Receive/Transmit mode, external/internal clock source
and different bit shift type by this port.
Port 31
3
2
1
0
STC
TMS
SES
SCSS
(Initial state : 0 0 0 0 )
SCSS Serial clock source slection
0
Internal clock
1
Externai clock
TMS
Transfer mode selection
0
Transmit mode
1
Receive mode
SES
0
1
STC
0
1
Shift edge selection
Shift at trailing edge of serial clock
Shift at leading edge of serial clock
Serial transfer command
Serial transfer terminate
Serial transfer start
DATA BUS
SIO INTERRUPT REQUEST
PORT 15
SIO BUFFER
MSB
LSB
SHIFT REGISTER
MSB
LSB
SIO INTERFACE
PORT 31
COMMAND PORT
PORT 14
STATUS PORT
I/O CONTROL
SIO CONTROL
SI
SO
SCK
P9.0
P9.1
P9.2
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