CHAPTER 14 SERIAL INTERFACE UART0
Preliminary User’s Manual U17260EJ3V1UD
340
(d) Reception
Reception is enabled and the R
X
D0 pin input is sampled when bit 7 (POWER0) of asynchronous serial
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
X
D0 pin input is
detected. When the set value of baud rate generator control register 0 (BRGC0) has been counted, the
R
X
D0 pin input is sampled again ( in Figure 14-9). If the R
X
D0 pin is low level at this time, it is recognized
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 reception error interrupt (INTSR0) is generated after completion of reception.
INTSR0 occurs upon completion of reception and in case of a reception error.
Figure 14-9. Reception Completion Interrupt Request Timing
R
X
D0 (input)
INTSR0
Start
D0
D1
D2
D3
D4
D5
D6
D7
Parity
Stop
RXB0
Cautions 1. If a reception error occurs, read asynchronous serial interface reception error status
register 0 (ASIS0) and then read receive buffer register 0 (RXB0) to clear the error flag.
Otherwise, an overrun error will occur when the next data is received, and the reception
error status will persist.
2. Reception is always performed with the “number of stop bits = 1”. The second stop bit
is ignored.
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