UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 323

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

(3) Asynchronous serial interface transmission status register 6n (ASIF6n)
Address: FF55H After reset: 00H R
Cautions 1. To transmit data continuously, write the first transmit data (first byte) to the TXB60 register.
Symbol
ASIF60
This register indicates the status of transmission by serial interfaces UART60 and UART61. It includes two status
flag bits (TXBF6n and TXSF6n).
Transmission can be continued without disruption even during an interrupt period, by writing the next data to the
TXB6n register after data has been transferred from the TXB6n register to the TXS6n register.
This register is read-only by an 8-bit memory manipulation instruction.
Reset signal generation, or clearing bit 7 (POWER6n) or bit 6 (TXE6n) of ASIM6n to 0 clears this register to 00H.
Figure 14-11. Format of Asynchronous Serial Interface Transmission Status Register 60 (ASIF60)
2. To initialize the transmission unit upon completion of continuous transmission, be sure to
TXBF60
TXSF60
Be sure to check that the TXBF60 flag is “0”. If so, write the next transmit data (second byte)
to the TXB60 register. If data is written to the TXB60 register while the TXBF60 flag is “1”, the
transmit data cannot be guaranteed.
check that the TXSF60 flag is “0” after generation of the transmission completion interrupt,
and then execute initialization. If initialization is executed while the TXSF60 flag is “1”, the
transmit data cannot be guaranteed.
7
0
0
1
0
1
If POWER60 = 0 or TXE60 = 0, or if data is transferred to transmit shift register 60 (TXS60)
If data is written to transmit buffer register 60 (TXB60) (if data exists in TXB60)
If POWER60 = 0 or TXE60 = 0, or if the next data is not transferred from transmit buffer register 60
(TXB60) after completion of transfer
If data is transferred from transmit buffer register 60 (TXB60) (if data transmission is in progress)
CHAPTER 14 SERIAL INTERFACES UART60 AND UART61
6
0
5
0
User’s Manual U17554EJ4V0UD
Transmit shift register data flag
4
0
Transmit buffer data flag
3
0
2
0
TXBF60
1
TXSF60
0
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