upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 230
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upd78f0730
Manufacturer Part Number
upd78f0730
Description
8-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0730.pdf
(518 pages)
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(3) Asynchronous serial interface transmission status register 6 (ASIF6)
230
Address: FF55H After reset: 00H R
Cautions 1. To transmit data continuously, write the first transmit data (first byte) to the TXB6 register.
Symbol
ASIF6
This register indicates the status of transmission by serial interface UART6. It includes two status flag bits
(TXBF6 and TXSF6).
Transmission can be continued without disruption even during an interrupt period, by writing the next data to the
TXB6 register after data has been transferred from the TXB6 register to the TXS6 register.
This register is read-only by an 8-bit memory manipulation instruction.
Reset signal generation sets this register to 00H if bit 7 (POWER6) and bit 6 (TXE6) of ASIM6 = 0.
Figure 10-4. Format of Asynchronous Serial Interface Transmission Status Register 6 (ASIF6)
2. To initialize the transmission unit upon completion of continuous transmission, be sure to
TXBF6
TXSF6
Be sure to check that the TXBF6 flag is “0”. If so, write the next transmit data (second byte)
to the TXB6 register. If data is written to the TXB6 register while the TXBF6 flag is “1”, the
transmit data cannot be guaranteed.
check that the TXSF6 flag is “0” after generation of the transmission completion interrupt,
and then execute initialization. If initialization is executed while the TXSF6 flag is “1”, the
transmit data cannot be guaranteed.
7
0
0
1
0
1
If POWER6 = 0 or TXE6 = 0, or if data is transferred to transmit shift register 6 (TXS6)
If data is written to transmit buffer register 6 (TXB6) (if data exists in TXB6)
If POWER6 = 0 or TXE6 = 0, or if the next data is not transferred from transmit buffer register 6
(TXB6) after completion of transfer
If data is transferred from transmit buffer register 6 (TXB6) (if data transmission is in progress)
6
0
CHAPTER 10 SERIAL INTERFACE UART6
Preliminary User’s Manual U19014EJ1V0UD
5
0
Transmit shift register data flag
4
0
Transmit buffer data flag
3
0
2
0
TXBF6
1
TXSF6
0
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