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M30620ECFS Folha de dados(PDF) 374 Page - Renesas Technology Corp

Nome de Peças M30620ECFS
Descrição Electrónicos  16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
PDF  621 Pages
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
Página de início  http://www.renesas.com
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M30620ECFS Folha de dados(HTML) 374 Page - Renesas Technology Corp

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UART
Mitsubishi microcomputers
M16C / 62 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
359
Example of wiring
Example of operation
TXDi
CTSi
RXD
Port
Microcomputer
Receiver side IC
(Note)
Note: Since TXD2 pin is N-channel open drain,
this pin needs pull-up resistor.
Transmit
enable bit (TE)
Transmit buffer
empty flag (Tl)
Transmit
register empty
flag (TXEPT)
D0 D1
D2 D3 D4 D5 D6 D7
ST
P
Start
bit
Parity
bit
TxDi
CTSi
“0”
“1”
“0”
“1”
“L”
“H”
“0”
“1”
Transmit
interrupt request
bit (IR)
“0”
“1”
Cleared to “0” when interrupt request is accepted, or cleared by software
D0 D1 D2 D3
D4 D5 D6
D7
ST
P
SP
D0 D1
ST
Shown in ( ) are bit symbols.
SP
Stopped pulsing because transfer enable bit = “0”
Stop
bit
Data is set in UARTi transmit buffer register
Transferred from UARTi transmit buffer register to UARTi transmit register
Tc
Transfer clock
When confirming stop bit, stopped transfer clock once because CTS = “H”
Started transfer clock again to start transmitting immediately after confirming CTS = “L”
(1) Transmission enabled
(2) Confirme CTS
(3) Start transmission
(4) Confirme stop bit
(5) Start transmission
The above timing applies to the following settings :
• Parity is enabled.
• One stop bit.
• CTS function is selected.
• Transmit interrupt cause select bit = “1”.
Tc = 16 (n + 1) / fi or 16 (n + 1) / fEXT
fi : frequency of BRGi count source (f1, f8, f32)
fEXT : frequency of BRGi count source (external clock)
n : value set to BRGi
Figure 2.5.8. Operation timing of transmission in UART mode



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