參數(shù)資料
型號： ML674000
廠商： OKI ELECTRIC INDUSTRY CO LTD
元件分類： 微控制器/微處理器
英文描述： 32-BIT, MROM, 33 MHz, RISC MICROCONTROLLER, PQFP128
封裝： 14 X 14 MM, 0.40 MM PITCH, PLASTIC, TQFP-128
文件頁數(shù)： 25/39頁
文件大小： 247K
代理商： ML674000
Rev.1.02
Jul 31, 2003
page 31 of 69
7560 Group (A version)
(2) Asynchronous Serial I/O (UART) Mode
Clock asynchronous serial I/O mode (UART) is selected by setting
the serial I/O1 mode selection bit of the serial I/O1 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 regis-
ter, but the two buffers have the same address (001816) in
memory. Since the shift register cannot be written to or read from
directly, transmit data is written to the transmit buffer, and receive
data is read from the receive buffer.
The transmit buffer can also hold the next data to be transmitted
during transmitting, and the receive buffer register can hold re-
ceived one-byte data while the next one-byte data is being re-
ceived.
Fig. 28 Block diagram of UART serial I/O1
Fig. 29 Operation of UART serial I/O1 function
XIN
1/4
OE
PE FE
1/16
Data bus
Receive buffer register
Address 001816
Receive shift register
Receive buffer full flag (RBF)
Receive interrupt request
Baud rate generator
Frequency division ratio 1/(n+1)
Address 001C16
ST/SP/PA generator
Transmit buffer register
Data bus
Transmit shift register
Address 001816
Transmit shift register shift completion flag (TSC)
Transmit buffer empty flag (TBE)
Transmit interrupt request
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 synchronization 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
TSC = “0”
TBE = “1”
RBF = “0”
TBE = “0”
RBF = “1”
ST
D0
D1
SP
D0
D1
ST
SP
TBE = “1”
TSC = “1”
ST
D0
D1
SP
D0
D1
ST
SP
Transmit buffer register write signal
Generated at 2nd bit in 2-stop-bit mode
1 start bit
7 or 8 data bits
1 or 0 parity bit
1 or 2 stop bit (s)
1 : Error flag detection occurs at the same time that the RBF flag becomes “1” (at 1st stop bit for reception).
2 : The serial I/O1 receive interrupt request occurs when the receive buffer full flag (RBF) becomes “1”.
3 : Select the serial I/O1 transmit interrupt request occurrence factor between when the transmit buffer register has emptied (TBE = “1”) or
after the transmit shift operation has ended (TSC = “1”), by setting the transmit interrupt source selection bit (TIC) of the serial
I/O1 control register.
Notes
Serial output TxD
Serial input RxD
Receive buffer register read signal
Transmit or receive clock
(Notes 1, 2)
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