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M30620FCAFP Datasheet(PDF) 133 Page - Mitsubishi Electric Semiconductor |
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M30620FCAFP Datasheet(HTML) 133 Page - Mitsubishi Electric Semiconductor |
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133 / 274 page  Clock asynchronous serial I/O (UART) mode Mitsubishi microcomputers M16C / 62A Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER 133 Figure 1.16.22. Typical transmit/receive timing in UART mode (used for the SIM interface) Transmit enable bit(TE) Transmit buffer empty flag(TI) Transmit register empty flag (TXEPT) D0 D1 D2 D3 D4 D5 D6 D7 ST P Start bit Parity bit The above timing applies to the following settings : • Parity is enabled. • One stop bit. • Transmit interrupt cause select bit = “1”. “0” “1” “0” “1” “0” “1” Tc = 16 (n + 1) / fi fi : frequency of BRG2 count source (f1, f8, f32) n : value set to BRG2 Transmit interrupt request bit (IR) “0” “1” D0 D1 D2 D3 D4 D5 D6 D7 ST P Shown in ( ) are bit symbols. Tc Transfer clock SP Stop bit Data is set in UART2 transmit buffer register SP An “L” level returns from TxD2 due to the occurrence of a parity error. The level is detected by the interrupt routine. The level is detected by the interrupt routine. Receive enable bit (RE) Receive complete flag (RI) D0 D1 D2 D3 D4 D5 D6 D7 ST P Start bit Parity bit RxD2 The above timing applies to the following settings : • Parity is enabled. • One stop bit. • Transmit interrupt cause select bit = “0”. “0” “1” “0” “1” Tc = 16 (n + 1) / fi fi : frequency of BRG2 count source (f1, f8, f32) n : value set to BRG2 Receive interrupt request bit (IR) “0” “1” D0 D1 D2 D3 D4 D5 D6 D7 ST P SP Shown in ( ) are bit symbols. Tc Transfer clock SP Stop bit An “L” level returns from TxD2 due to the occurrence of a parity error. TxD2 Read to receive buffer Read to receive buffer D0 D1 D2 D3 D4 D5 D6 D7 ST P Signal conductor level (Note 2) D0 D1 D2 D3 D4 D5 D6 D7 ST P SP SP D0 D1 D2 D3 D4 D5 D6 D7 ST P D0 D1 D2 D3 D4 D5 D6 D7 ST P SP SP TxD2 RxD2 Signal conductor level (Note 2) Note 2: Equal in waveform because TxD2 and RxD2 are connected. Transferred from UART2 transmit buffer register to UART2 transmit register Cleared to “0” when interrupt request is accepted, or cleared by software Cleared to “0” when interrupt request is accepted, or cleared by software Note 1: The transmit is started with overflow timing of BRG after having written in a value at the transmit buffer in the above timing. Note 1 |
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