upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 257

• Manufacturer Part Number: upd78f0114hgb-8es-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(d) Reception
R
X
D0 (input)
Reception is enabled and the R
interface operation mode register 0 (ASIM0) is set to 1 and then bit 5 (RXE0) of ASIM0 is set to 1.
The 5-bit counter of the baud rate generator starts counting when the falling edge of the R
detected. When the set value of baud rate generator control register 0 (BRGC0) has been counted, the
R
as a start bit.
When the start bit is detected, reception is started, and serial data is sequentially stored in receive shift
register 0 (RXS0) at the set baud rate. When the stop bit has been received, the reception completion
interrupt (INTSR0) is generated and the data of RXS0 is written to receive buffer register 0 (RXB0). If an
overrun error (OVE0) occurs, however, the receive data is not written to RXB0.
Even if a parity error (PE0) occurs while reception is in progress, reception continues to the reception
position of the stop bit, and an error interrupt (INTSR0) is generated after completion of reception.
Cautions 1. Be sure to read receive buffer register 0 (RXB0) even if a reception error occurs.
INTSR0
X
RXB0
D0 pin input is sampled again (
2. Reception is always performed with the “number of stop bits = 1”. The second stop bit
3. Be sure to read asynchronous serial interface reception error status register 0 (ASIS0)
Otherwise, an overrun error will occur when the next data is received, and the reception
error status will persist.
is ignored.
before reading RXB0.
Start
Figure 12-9. Reception Completion Interrupt Request Timing
D0
CHAPTER 12 SERIAL INTERFACE UART0
D1
X
D0 pin input is sampled when bit 7 (POWER0) of asynchronous serial
in Figure 12-9). If the R
User’s Manual U16961EJ4V0UD
D2
D3
D4
D5
X
D0 pin is low level at this time, it is recognized
D6
D7
Parity
Stop
X
D0 pin input is
257