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參數(shù)資料
| 型號： | M38020M1 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single Output LDO, 800mA, Fixed(2.5V), Internal Current limit, Thermal Overload Protection 8-SON 0 to 125 |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁數(shù)： | 11/51頁 |
| 文件大小： | 692K |
| 代理商： | M38020M1 |
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MITSUBISHI MICROCOMPUTERS
3802 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
19
Asynchronous serial I/O (UART) mode
Clock asynchronous serial I/O mode (UART) can be selected by
clearing the serial I/O mode selection bit of the serial I/O control
register to “0”.
Eight serial data transfer formats can be selected, and the transfer
formats used by a transmitter and receiver must be identical.
The transmit and receive shift registers each have a buffer, but the
two buffers have the same address in memory. Since the shift reg-
ister cannot be written to or read from directly, transmit data is
written to the transmit buffer, and receive data is read from the re-
ceive buffer.
The transmit buffer can also hold the next data to be transmitted,
and the receive buffer can hold a character while the next charac-
ter is being received.
Fig. 12 Block diagram of UART serial I/O
f(XIN)
1/4
OE
PE FE
1/16
Data bus
Receive buffer
Address 001816
Receive shift register
Receive buffer full flag (RBF)
Receive interrupt request (RI)
Baud rate generator
Frequency division ratio 1/(n+1)
Address 001C16
ST/SP/PA generator
Transmit buffer
Data bus
Transmit shift register
Address 001816
Transmit shift completion flag (TSC)
Transmit buffer empty flag (TBE)
Transmit interrupt request (TI)
Address 001916
STdetector
SP detector
UART control register
Address 001B16
Character length selection bit
Address 001A16
BRG count source selection bit
Transmit interrupt source selection bit
Serial I/O1 synchronous clock selection bit
Clock control circuit
Character length selection bit
7 bits
8 bits
Serial I/O1 control register
P46/SCLK1
Serial I/O1 status register
P44/RXD
P45/TXD
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