參數(shù)資料
型號: UPD78218AGC
廠商: NEC Corp.
元件分類: 8位微控制器
英文描述: 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述: 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存
文件頁數(shù): 25/66頁
文件大?。?/td> 510K
代理商: UPD78218AGC
25
μ
PD78217A, 78218A
3.6.1
Asynchronous Serial Interface
The
μ
PD78217A/78218A incorporates UART (Universal Asynchronous Receiver Transmitter) as the asynchronous
serial interface. UART is used to send/receive one byte of data following a start bit.
The UART incorporates a dedicated baud rate generator which can generate a wide range of desired baud rates
and also determine baud rates by scaling the ASCK pin input clocks or 8-bit timer/counter 3 output (TM3 output),
allowing transmission/reception with a variety of baud rates.
If the UART dedicated baud rate generator is used, the MIDI standard baud rate (31.25 kbps) can also be obtained.
Fig. 3-7 Asynchronous Serial Interface (UART) Block Diagram
f
CLK
: Internal system clock frequency (System Clock Frequency/2)
ASCK
R
X
D
T
X
D
Receive Buffer
Receive Shift
Register
Receive Control
Parity Check
1/16
Internal Bus
Transmit Shift
Register
Transmit Control
Parity Addition
1/16
INTSR
INTSER
INTST
TXS
RXB
S
S
S
1/N
2
1/N
1
f
CLK
1/2
TM3 Output
UART Dedicated Baud Rate Generator
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