參數(shù)資料
型號: UPD784908
廠商: NEC Corp.
英文描述: 16-BIT SINGLE-CHIP MICROCONTROLLER
中文描述: 16位單片機
文件頁數(shù): 45/98頁
文件大小: 657K
代理商: UPD784908
μ
PD784907, 784908
45
Data Sheet U11680EJ2V0DS00
RXB, RXB2
TXS, TXS2
INTST, INTST2
INTSR,
INTSR2
INTSER,
INTSER2
1/2m
f
XX
ASCK, ASCK2
TxD, TxD2
RxD, RxD2
1/2
n+1
1/2m
Baud rate generator
Receive
shift register
Receive buffer
S
Transmission
control parity
bit addition
Transmission
shift register
Internal bus
Reception
control parity
check
8.8.1 Asynchronous serial interface/3-wire serial I/O (UART/IOE)
Two serial interface channels, from which asynchronous serial interface mode and 3-wire serial I/O mode can be
selected, are provided.
(1) Asynchronous serial interface mode
In this mode, 1-byte data is transferred or received after a start bit.
A baud rate generator is incorporated to enable communication at a wide range of baud rates.
A baud rate can be defined by dividing the frequency of a clock signal input to the ASCK pin.
By using the baud rate generator, a baud rate conforming to the MIDI standard (31.25 kbps) can be obtained.
Figure 8-11. Block Diagram of Asynchronous Serial Interface Mode
Remark
f
XX
: Oscillating frequency or external clock input frequency
n = 0 to 11
m = 16 to 30
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