參數(shù)資料
型號: S1C88848D0A0100
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, UUC192
封裝: DIE-192
文件頁數(shù): 133/174頁
文件大?。?/td> 1304K
代理商: S1C88848D0A0100
S1C88848 TECHNICAL MANUAL
EPSON
53
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Serial Interface)
(6) Clock source control
When the programmable timer is selected for
the clock source, set transfer rate on the pro-
grammable timer side. (See "5.10 Programmable
Timer".)
When the divided signal of OSC3 oscillation
circuit is selected for the clock source, be sure
that the OSC3 oscillation circuit is turned ON
prior to commencing data transfer. (See "5.3
Oscillation Circuits".)
■ Data transmit procedure
The control procedure and operation during
transmitting is as follows.
(1) Write "0" in the transmit enable register TXEN
to reset the serial interface.
(2) Write "1" in the transmit enable register TXEN
to set into the transmitting enable status.
(3) Write the transmitting data into TRXD0–TRXD7.
Also, when 7-bit data is selected, the TRXD7
data becomes invalid.
(4) Write "1" in the transmit control bit TXTRG and
start transmitting.
This control causes the shift clock to change to
enable and a start bit (LOW) is output to the
SOUT terminal in synchronize to its rising edge.
The transmitting data set to the shift register is
shifted one bit at a time at each rising edge of
the clock thereafter and is output from the
SOUT terminal. After the data output, it outputs
a stop bit (HIGH) and HIGH level is maintained
until the next start bit is output.
The transmitting complete interrupt factor flag
FSTRA is set to "1" at the point where the data
transmitting is completed. When interrupt has
been enabled, a transmitting complete interrupt
is generated at this point.
Set the following transmitting data using this
interrupt.
(5) Repeat steps (3) to (4) for the number of bytes of
transmitting data, and then set the transmit
disable status by writing "0" to the transmit
enable register TXEN, when the transmitting is
completed.
Data transmitting
End
TXEN
← 0
No
Yes
Transmit complete ?
Set transmitting data
to TRXD0–TRXD7
No
Yes
FSTRA = 1 ?
TXEN
← 0
TXTRG
← 1
TXEN
← 1
Fig. 5.7.7.2 Transmit procedure in asynchronous mode
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