參數(shù)資料
型號： M38C89EFFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP144
封裝： 20 X 20 MM, 0.50 MM PITCH, PLASTIC, LQFP-144
文件頁數(shù)： 19/54頁
文件大?。?/td> 805K
代理商： M38C89EFFP
26
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
38C8 Group
[Transmit Buffer/Receive Buffer Register
(TB/RB)] 001816
The transmit buffer register and the receive buffer register are lo-
cated at the same address. The transmit buffer register is write-only
and the receive buffer register is read-only. If a character bit length is
7 bits, the MSB of data stored in the receive buffer register is “0”.
[Serial I/O Status Register (SIOSTS)] 001916
The read-only serial I/O status register consists of seven flags (bits 0
to 6) which indicate the operating status of the serial I/O function and
various errors.
Three of the flags (bits 4 to 6) are valid only in UART mode.
The receive buffer full flag (bit 1) is cleared to “0” when the receive
buffer is read.
If there is an error, it is detected at the same time that data is trans-
ferred from the receive shift register to the receive buffer register,
and the receive buffer full flag is set. A write to the serial I/O status
register clears all the error flags OE, PE, FE, and SE. Writing “0” to
the serial I/O enable bit (SIOE) also clears all the status flags, includ-
ing the error flags.
All bits of the serial I/O status register are initialized to “0” at reset,
but if the transmit enable bit (bit 4) of the serial I/O control register
has been set to “1”, the transmit shift register shift completion flag
(bit 2) and the transmit buffer empty flag (bit 0) become “1”.
[Serial I/O Control Register (SIOCON)] 001A16
The serial I/O control register contains eight control bits for the serial
I/O function.
[UART Control Register (UARTCON)] 001B16
This is a 5 bit register containing four control bits, which are valid
when UART is selected and set the data format of an data receiver/
transfer, and one control bit, which is always valid and sets the out-
put structure of the P45/TXD pin.
[Baud Rate Generator (BRG)] 001C16
The baud rate generator determines the baud rate for serial transfer.
The baud rate generator divides the frequency of the count source
by 1/(n + 1), where n is the value written to the baud rate generator.
sNotes on serial I/O
When setting the transmit enable bit to “1”, the serial I/O transmit
interrupt request bit is automatically set to “1”. When not requiring
the interrupt occurrence synchronized with the transmission enabled,
take the following sequence.
Set the serial I/O transmit interrupt enable bit to “0” (disabled).
Set the transmit enable bit to “1”.
Set the serial I/O transmit interrupt request bit to “0” after 1 or more
instructions have been executed.
Set the serial I/O transmit interrupt enable bit to “1” (enabled).
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