參數(shù)資料
型號(hào): μPD784031Y
廠商: NEC Corp.
英文描述: 8/16 Bit Single Chip Microcontrollers(8/16 位微控制器)
中文描述: 8 / 16位單片機(jī)微控制器(8 / 16位微控制器)
文件頁(yè)數(shù): 36/66頁(yè)
文件大?。?/td> 392K
代理商: ΜPD784031Y
36
μ
PD784031Y
7.8.1 Asynchronous serial interface/3-wire serial I/O (UART/IOE)
Two channels of serial interfaces that can select an asynchronous serial interface mode and 3-wire serial I/O
mode are provided.
(1) Asynchronous serial interface mode
In this mode, data of 1 byte following the start bit is transferred or received.
Because an on-chip baud rate generator is provided, a wide range of baud rates can be set.
Moreover, the clock input to the ASCK pin can be divided to define a baud rate.
When the baud rate generator is used, a baud rate conforming to the MIDI standard (31.25 kbps) can be
also obtained.
Figure 7-10. Block Diagram in Asynchronous Serial Interface Mode
1/2m
1/2m
1/2
n+1
Receive buffer
RXB, RXB2
Receive shift
register
Transmit shift
register
Receive control
parity check
Trnsmit control
Parity append
R
X
D, R
X
D2
T
X
D, T
X
D2
INTSR,
INTSR2
INTSER,
INTSER2
TXS, TXS2
INTST, INTST2
Baud rate generator
f
XX
/2
ASCK, ASCK2
S
Internal bus
Remark
f
XX
: oscillation frequency or external clock input
n = 0 through 11
m = 16 through 30
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