UPD78F9234MC-5A4-A Renesas Electronics America, UPD78F9234MC-5A4-A Datasheet - Page 207

• Manufacturer Part Number: UPD78F9234MC-5A4-A
• Description: MCU 8BIT 8KB FLASH 30PIN
• Manufacturer: Renesas Electronics America
• Series: 78K0S/Kx1+r

Specifications of UPD78F9234MC-5A4-A

• Core Processor: 78K0S
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(d) Continuous transmission
The next transmit data can be written to transmit buffer register 6 (TXB6) as soon as transmit shift register 6
(TXS6) has started its shift operation. Consequently, even while the INTST6 interrupt is being serviced after
transmission of one data frame, data can be continuously transmitted and an efficient communication rate
can be realized. In addition, the next transmit data can be written to the TXB6 register without having to wait
for the transmission time of one data frame, by confirming bit 0 (TXSF6) of asynchronous serial interface
transmission status register 6 (ASIF6) after a transmission completion interrupt has occurred.
To transmit data continuously, be sure to reference the ASIF6 register to check the transmission status and
whether the TXB6 register can be written, and then write the data.
For the continuous transmission procedure, refer to Figure 11-16 Example of Continuous Transmission
Processing Flow.
Cautions 1. Use the value of the TXBF6 flag to judge whether continuous transmission is possible.
Caution To transmit data continuously, write the first transmit data (first byte) to the TXB6 register.
The communication status can be checked using the TXSF6 flag.
Caution To initialize the transmission unit upon completion of continuous transmission, be sure to
2. When the interface is used in LIN communication operation, the continuous
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.
TXBF6
TXSF6
0
1
0
1
Do not write the next transmit data, by making a judgment only by the fact that the
TXSF6 flag has been set to 1.
transmission function cannot be used. Make sure that asynchronous serial interface
transmission status register 6 (ASIF6) is 00H before writing transmit data to transmit
buffer register 6 (TXB6).
Writing enabled
Writing disabled
Transmission is completed.
Transmission is in progress.
CHAPTER 11 SERIAL INTERFACE UART6
User’s Manual U17446EJ5V0UD
Writing to TXB6 Register
Transmission Status
205