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)： 22/38頁(yè)
文件大?。?/td> 197K
代理商： EM73400
22
* This specification are subject to be changed without notice.
6.11.1998
EM73400
4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT
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
LDIA #1010b;
OUTA P15 ; Load immediate data 0Ah P15(SIO data buffer)
LDlA #0000b;
OUTA P31 ; sending SIO in transmission mode with internal clock.
LDIA #1000b
OUTA P31 ; start SIO transfer.
(2) . To terminate the SIO transmission mode with internal clock
LDIA
#0000b;
OUTA
P31 ; terminate SIO in transmission mode with internal clock.
SIOEND:
TTP
P14,3
SBR
SIOEND; Check SIO ending ; SCSS=0.
b. External clock type:
Except the transfer clock source is come from outside system, The external clock transmit mode
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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