UPD78F0500AMC-CAB-AX Renesas Electronics America, UPD78F0500AMC-CAB-AX Datasheet - Page 475

• Manufacturer Part Number: UPD78F0500AMC-CAB-AX
• Description: MCU 8BIT 30SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2r

Specifications of UPD78F0500AMC-CAB-AX

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 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: -

78K0/Kx2
R01UH0008EJ0401 Rev.4.01
Jul 15, 2010
(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 TXB6 register can be efficiently written twice (2 bytes) without having to wait for the
transmission time of one data frame, by reading bit 0 (TXSF6) of asynchronous serial interface transmission
status register 6 (ASIF6) when the 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.
Cautions 1. The TXBF6 and TXSF6 flags of the ASIF6 register change from “10” to “11”, and to “01”
Caution To transmit data continuously, write the first transmit data (first byte) to the TXB6 register. Be
The communication status can be checked using the TXSF6 flag.
Cautions 1. To initialize the transmission unit upon completion of continuous transmission, be sure to
2. When the device is use in LIN communication operation, the continuous transmission
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.
2. During continuous transmission, the next transmission may complete before execution of
TXBF6
TXSF6
during continuous transmission. To check the status, therefore, do not use a combination
of the TXBF6 and TXSF6 flags for judgment. Read only the TXBF6 flag when executing
continuous 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).
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.
INTST6 interrupt servicing after transmission of one data frame. As a countermeasure,
detection can be performed by developing a program that can count the number of transmit
data and by referencing the TXSF6 flag.
0
1
0
1
Writing enabled
Writing disabled
Transmission is completed.
Transmission is in progress.
Writing to TXB6 Register
Transmission Status
CHAPTER 15 SERIAL INTERFACE UART6
475