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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)： | 28/44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
PROGRAM EXAMPLE:
(1) . To transfer a immediate data (0Ah) out by transmit mode with external clock
LDIA #1010b:
OUTA P15 ; Load immediate data 0Ah to P15(SIO data buffer)
LDIA #0001b;
OUTA P31 ; setting SIO in transmission mode with exernal cbck.
LDIA #1001b
OUTA P31 ; start SIO transer.
:
(2) . To terminate the SIO transmission mode with external clock
LDIA #0001b;
OUTA P31 ; terminate SIO in transmission mode with external clock.
SIOEND: TTP P14,3
SBR SIOEND; Check SIO ending; SCSS =0 .
Receive mode
a. Internal clock type :
Receive mode with internal clock type is transfer 4-bit data from outside system to SIO data buffer of CPU
by CPU internal clock. There are two types of internal clock receive modes; one is data shift in leading edge,
the other in 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 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 rountine, then the interrupt request will be cleared.
7.To stop current SIO receive mode is Sending STC(P31.3) "0" in interrupt service rountine, 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.
SIO internal clock receive mode with leading edge shift type
STC
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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