M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 210

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SERIAL I/O
7.4 Clock asynchronous serial I/O (UART) mode
7–44
7.4.4 Transmit operation
Simultaneously when the transmit conditions listed on page 7-40 are satisfied, the following operations are
automatically performed.
•The UARTi transmit buffer register’s contents are transferred to the UARTi transmit register.
•The transmit buffer empty flag is set to “1.”
•The transmit register empty flag is cleared to “0.”
•The UARTi transmit interrupt request occurs and the interrupt request bit is set to “1.”
The transmit operations are described below.
When the transmit conditions for the next data are satisfied at completion of transmission, the start bit is
generated following the stop bit, and the next data is transmitted. When performing transmission continuously,
set the next transmit data in the UARTi transmit buffer register during transmission (when the transmit
register empty flag = “0”). When the transmit conditions for the next data are not satisfied, the TxD
outputs “H” level.
Figures 7.4.6 shows example of transmit timing when the transfer data length is 8 bits, and Figure 7.4.7
shows an example of transmit timing when the transfer data length is 9 bits.
Data in the UARTi transmit register is transmitted from the TxD
This data is transmitted bit by bit sequentially in order of ST
When the stop bit has been transmitted, the transmission register empty flag is set to “1,” indicating
completion of transmission.
SP according to the set transfer data format.
7702/7703 Group User’s Manual
DATA (LSB)
i
pin.
••• DATA (MSB) PAR
i
pin