參數(shù)資料
型號(hào)： M38504M6A-XXXFP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, MROM, 6.25 MHz, MICROCONTROLLER, PDSO42
封裝： 8.40 X 17.50 MM, 0.80 MM PITCH, PLASTIC, SSOP-42
文件頁(yè)數(shù)： 18/59頁(yè)
文件大小： 885K
代理商： M38504M6A-XXXFP
Rev.2.13
Apr 17, 2009
Page 25 of 56
REJ03B0125-0213
3850 Group (Spec.A QzROM version)
(2) Asynchronous Serial I/O (UART) Mode
Clock asynchronous serial I/O mode (UART) can be selected by
clearing the serial I/O1 mode selection bit (b6) 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, but
the two buffers have the same address in memory. Since the shift
register cannot be written to or read from directly, transmit data
is written to the transmit buffer register, and receive data is read
from the receive buffer register.
The transmit buffer register can also hold the next data to be
transmitted, and the receive buffer register can hold a character
while the next character is being received.
Fig 22. Block diagram of UART serial I/O1
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 (RI)
Baud rate generator
Frequency division ratio 1/(n+1)
Address 001C16
ST/SP/PA generator
Transmit buffer register
Transmit shift register
Address 001816
Transmit shift
completion flag (TSC)
Transmit buffer empty flag (TBE)
Transmit interrupt request (TI)
Address 001916
ST detector
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 status register
Serial I/O1 control register
P26/SCLK1
P24/RXD
P25/TXD
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