參數(shù)資料
型號(hào): UPD784224Y
廠商: NEC Corp.
英文描述: 16/8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 16/8-BIT單晶片微控制器
文件頁(yè)數(shù): 40/92頁(yè)
文件大小: 687K
代理商: UPD784224Y
40
μ
PD784224, 784225, 784224Y, 784225Y
Data Sheet U12376EJ1V0DS00
7.7.1 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
Internal bus
8
8
8
Receive buffer register
1, 2 (RXB1, RXB2)
Receive shift register
1, 2 (RX1, RX2)
Transmit shift register
1, 2 (TXS1, TXS2)
Receive control
parity check
Transmit control
parity addition
RxD1, RxD2
TxD1, TxD2
ASCK1, ASCK2
Baud rate generator
INTSR1,
INTSR2
INTST1,
INTST2
Selector
5-bit counter
×
2
Transmit/receive clock generation
f
XX
to f
XX
/2
5
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