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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)： | 26/44頁 |
| 文件大?。?/td> | 231K |
| 代理商： | EM73492 |
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26
EM73492
4-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
* This specification are subject to be changed without notice.
7.17.1998
Leading edge shift mode
2. Trailing edge shift mode:
Every bit of SIO data is shifted by the trailing edge of serial clock ( risinging edge of SCK )
Trailing edge shift mode
SIO FUNCTION DESCRIPTION
Transmit mode
a. Internal clock type:
Transmit mode with internal clock type transfers 4-bit data from CPU to outside system by a serial clock
of CPU internal clock, It's achieved by setting P31 to "X000". since transmit mode only can transfer data
by leading edge type . so the bit 1 of P13 (SES) only can be "0".
The operation procedure of transmission mode with internal clock is as following .
1. Setting transfer out data to P15(SIO data buffer).
2. Setting the transfer mode and type by setting P13 = 0000 .
3. Start SIO transfer by setting P13 = 1000 .
4. By the internal clock ( clock rate = fc /2
7
), SIO control start to transfer 4-bit data out from LSB to
MSB to P9.1/SO by shift register at every leading edge of SIO serial clock.
5. As SIO processing, user can get the SIO condition by P14.
6. When SIO data buffer sending data to shift register and becoming empty, the SIO control unit will send
a SIO interrupt request to interrupt service rountine to request next data.
7. The SIO interface will be in "wait state" (SCK will stop ) until the SIOI interrupt service rountine give
next transfer data to the SIO data buffer ( P15 ), then the interrupt will be cleared automatically .
8. In another words, Sending STC(P31.3) "0" in SIOI interrupt rountine instead of next transfer data will
stop the current SIO operation, user can detect the SIO ending by SCSS ( P14.3) be "0".
SIO transmission mode with internal clock
PROGRAM EXAMPLE:
(1) . To transfer a immediate data (0Ah) out by transmission mode with internal clock
SCK
Data shift position
SCK
Data shift position
STC
SIOS
SIOSS
SCK
SO
SIOI
PORT 15
D
D'
D0
D1
D2
D3
D'
0
D'
1
D'
2
D'
3
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