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M16C/62 Datasheet(PDF) 374 Page - Renesas Technology Corp |
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M16C/62 Datasheet(HTML) 374 Page - Renesas Technology Corp |
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374 / 621 page  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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