UPD78F0138 NEC, UPD78F0138 Datasheet - Page 293

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

14.1 Functions of Serial Interface UART6
(1) Operation stop mode
(2) Asynchronous serial interface (UART) mode
Serial interface UART6 has the following two modes.
This mode is used when serial communication is not executed and can enable a reduction in the power
consumption.
For details, see 14.4.1 Operation stop mode.
This mode supports the LIN (Local Interconnect Network)-bus. The functions of this mode are outlined below.
For details, see 14.4.2
generator.
• Two-pin configuration
• Data length of communication data can be selected from 7 or 8 bits.
• Dedicated internal 8-bit baud rate generator allowing any baud rate to be set
• Transmission and reception can be performed independently.
• Twelve operating clock inputs selectable
• MSB- or LSB-first communication selectable
• Inverted transmission operation
• Synchronous break field transmission from 13 to 20 bits
• More than 11 bits can be identified for synchronous break field reception (SBF reception flag provided).
Cautions 1. The T
2. If clock supply to serial interface UART6 is not stopped (e.g., in the HALT mode), normal
3. If data is continuously transmitted, the communication timing from the stop bit to the next
side. To use this function, the reception side must be ready for reception of inverted data.
operation continues. If clock supply to serial interface UART6 is stopped (e.g., in the STOP
mode), each register stops operating, and holds the value immediately before clock supply
was stopped. The T
stopped and outputs it. However, the operation is not guaranteed after clock supply is
resumed. Therefore, reset the circuit so that POWER6 = 0, RXE6 = 0, and TXE6 = 0.
start bit is extended two operating clocks of the macro. However, this does not affect the
result of communication because the reception side initializes the timing when it has
detected a start bit. Do not use the continuous transmission function if the interface is
incorporated in LIN.
X
D6 output inversion function inverts only the transmission side and not the reception
Asynchronous serial interface (UART) mode and 14.4.3
T
R
CHAPTER 14 SERIAL INTERFACE UART6
X
X
D6: Transmit data output pin
B6: Receive data input pin
X
D6 pin also holds the value immediately before clock supply was
User’s Manual U16228EJ2V0UD
Dedicated baud rate
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