M16C62N Datasheet, PDF (109/213 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Clock asynchronous serial I/O (UART) mode
Mitsubishi microcomputers
M16C / 62N Group (80-pin)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Example of transmit timing when transfer data is 8 bits long (parity enabled, one stop bit)
Tc
Transfer clock
Transmit enable ^{“1”}
bit(TE)
“0”
Transmit buffer
“1”
empty flag(TI)
“0”
TxD2
Data is set in UART2 transmit buffer register
Note
Transferred from UART2 transmit buffer register to UARTi transmit register
Start
bit
Parity _Stop
bit
bit
ST D0 D1 D2 D3 D4 D5 D6 D7 P SP
ST D0 D1 D2 D3 D4 D5 D6 D7 P SP
Transmit register ^{“1”}
empty flag (TXEPT) _{“0”}
Transmit interrupt ^{“1”}
request bit (IR)
“0”
Shown in ( ) are bit symbols.
Cleared to “0” when interrupt request is accepted, or cleared by software
The above timing applies to the following settings :
• Parity is enabled.
• One stop bit.
• Transmit interrupt cause select bit = “1”.
Tc = 16 (n + 1) / fi
fi : frequency of BRG2 count source (f1, f8, f32)
n : value set to BRG2
Note: The transmit is started with overflow timing of BRG after having written in a value at the transmit buffer in the above timing.
Figure 1.14.17. Typical transmit timings in UART mode(UART2)
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