upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 243
upd78f0114hgb-8es-a
Manufacturer Part Number
upd78f0114hgb-8es-a
Description
8-bit Single-chip Microcontrollers
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0114HGB-8ES-A.pdf
(505 pages)
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12.1 Functions of Serial Interface UART0
(1) Operation stop mode
(2) Asynchronous serial interface (UART) mode
Serial interface UART0 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 12.4.1 Operation stop mode.
The functions of this mode are outlined below.
For details, see 12.4.2
generator.
Cautions 1. If clock supply to serial interface UART0 is not stopped (e.g., in the HALT mode), normal
Two-pin configuration
Length of communication data can be selected from 7 or 8 bits.
Dedicated on-chip 5-bit baud rate generator allowing any baud rate to be set
Transmission and reception can be performed independently.
Four operating clock inputs selectable
Fixed to LSB-first communication
2. Set POWER0 = 1 and then set TXE0 = 1 (transmission) or RXE0 = 1 (reception) to start
3. TXE0 and RXE0 are synchronized by the base clock (f
operation continues. If clock supply to serial interface UART0 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 POWER0 = 0, RXE0 = 0, and TXE0 = 0.
communication.
transmission or reception again, set TXE0 or RXE0 to 1 at least two clocks of base clock
after TXE0 or RXE0 has been cleared to 0. If TXE0 or RXE0 is set within two clocks of base
clock, the transmission circuit or reception circuit may not be initialized.
Asynchronous serial interface (UART) mode and 12.4.3
T
R
CHAPTER 12 SERIAL INTERFACE UART0
X
X
D0: Transmit data output pin
D0: Receive data input pin
X
D0 pin also holds the value immediately before clock supply was
User’s Manual U16961EJ4V0UD
XCLK0
) set by BRGC0. To enable
Dedicated baud rate
243
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