UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 365

• Manufacturer Part Number: UPD78F0537DGA(T)-9EV-A
• Description: 8BIT MCU, 128K FLASH, 7KB RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F0537DGA(T)-9EV-A

• Controller Family/series: UPD78
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

(3) Asynchronous serial interface transmission status register 6 (ASIF6)
(4) Clock selection register 6 (CKSR6)
Address: FF55H After reset: 00H R
Cautions 1. To transmit data continuously, write the first transmit data (first byte) to the TXB6 register.
Remark CKSR6 can be refreshed (the same value is written) by software during a communication operation
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, or clearing bit 7 (POWER6) or bit 6 (TXE6) of ASIM6 to 0 clears this register to 00H.
This register selects the base clock of serial interface UART6.
CKSR6 can be set by an 8-bit memory manipulation instruction.
Reset signal generation sets this register to 00H.
Figure 15-7. Format of Asynchronous Serial Interface Transmission Status Register 6 (ASIF6)
(when bits 7 and 6 (POWER6, TXE6) of ASIM6 = 1 or bits 7 and 5 (POWER6, RXE6) of ASIM6 = 1).
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 15 SERIAL INTERFACE UART6
5
0
User’s Manual U17260EJ6V0UD
Transmit shift register data flag
4
0
Transmit buffer data flag
3
0
2
0
TXBF6
1
TXSF6
0
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