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(yè)數(shù)： 24/38頁(yè)
文件大小： 197K
代理商： EM73400
24
* This specification are subject to be changed without notice.
6.11.1998
EM73400
4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT
Receive mode with internal clock type is transfer 4-bit data from outside system to SIO data buffer of CPU
internal clock. There are two types of internal clock receive modes; one is data shift in leading edge, the other
is trailing edge, these different condition settings are decided by P31.
The operation procedure of receive mode with internal clock is as following :
1. Setting the receive mode and type by setting P31= 0 1 X 0.
2. Start SIO transfer by setting P31=1 1 X 0.
3. By the internal clock (clock rate=fc/2
7
), SIO control start to transfer 4-bit data into shift register from LSB
to MSB from P9.0/SI pin until the shift register is full.
4. As SIO processing, user can get the SIO status by P14.
5. When the shift register has already shift 4-bit data in and become full, the SIO control will send data to SIO
data buffer (P15) and generate a SIOI interrupt request to read the data out.
6. The SIO interface will in "wait" state (SCK stopped) until CPU read out the data from P15 by the interrupt
service routine, then the interrupt request will be cleared.
7. To stop current SIO receive mode is sending STC(P31.3) "0" in interrupt service routine, then the current
SIO transfer will be stoped, user can detect the SIO ending by SCSS (P14.3) be "0".
NOTE : The leading edge shift mode is shift data in every leading edge of serial clock (the falling edge of SCK,
for receive mode of leading edge type, user must put the data in P9.0/SI before the serial clock start.
STC
SIO internal clock receive mode with leading edge shift type
STC
SIO external clock receive mode with trailing edge shift type
PROGRAM EXAMPLE:
(1a) . To receive 4-bit data by internal clock with leading edge shift mode .
LDIA
#0100b;
OUTA P31 ; setting SIO in internal clock receive mode with leading edge shift type.
LDIA
#1100b
OUTA P31 ; start SIO transfer
SIOS
SIOSS
SCK
SI
SIOI
PORT 15
D
D'
D0 D1
D2
D3
D'0
D'1
D'2
D'3
Read SIO data buffer (P15)
SIOS
SIOSS
SCK
SI
SIOI
PORT 15
D
D'
D0
D1
D2 D3
D'0
D'1
D'2
D'3
Read SIO data buffer (P15)
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