upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 239

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

1. Stop bit length: 1
2. Stop bit length: 2
(c) Normal transmission
When bit 7 (POWER6) of asynchronous serial interface operation mode register 6 (ASIM6) is set to 1 and bit
6 (TXE6) of ASIM6 is then set to 1, transmission is enabled. Transmission can be started by writing transmit
data to transmit buffer register 6 (TXB6). The start bit, parity bit, and stop bit are automatically appended to
the data.
When transmission is started, the data in TXB6 is transferred to transmit shift register 6 (TXS6). After that,
the transmit data is sequentially output from TXS6 to the T
parity and stop bits set by ASIM6 are appended and a transmission completion interrupt request (INTST6) is
generated.
Transmission is stopped until the data to be transmitted next is written to TXB6.
Figure 10-10 shows the timing of the transmission completion interrupt request (INTST6). This interrupt
occurs as soon as the last stop bit has been output.
T
T
X
X
D6 (output)
D6 (output)
INTST6
INTST6
Figure 10-10. Normal Transmission Completion Interrupt Request Timing
Start
Start
CHAPTER 10 SERIAL INTERFACE UART6
D0
D0
Preliminary User’s Manual U19014EJ1V0UD
D1
D1
D2
D2
X
D6 pin. When transmission is completed, the
D6
D6
D7
D7
Parity
Parity
Stop
Stop
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