HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 689
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HD6412320
Manufacturer Part Number
HD6412320
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412320.pdf
(1302 pages)
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Section 14 Serial Communication Interface (SCI)
Break Detection and Processing (Asynchronous Mode Only): When framing error (FER)
detection is performed, a break can be detected by reading the RxD pin value directly. In a break,
the input from the RxD pin becomes all 0s, and so the FER flag is set, and the parity error flag
(PER) may also be set.
Note that, since the SCI continues the receive operation after receiving a break, even if the FER
flag is cleared to 0, it will be set to 1 again.
Sending a Break (Asynchronous Mode Only): The TxD pin has a dual function as an I/O port
whose direction (input or output) is determined by DR and DDR. This can be used to send a break.
Between serial transmission initialization and setting of the TE bit to 1, the mark state is replaced
by the value of DR (the pin does not function as the TxD pin until the TE bit is set to 1).
Therefore, DDR and DR for the port corresponding to the TxD pin should first be set to 1.
To send a break during serial transmission, first clear DR to 0, then clear the TE bit to 0.
When the TE bit is cleared to 0, the transmitter is initialized regardless of the current transmission
state, the TxD pin becomes an I/O port, and 0 is output from the TxD pin.
Receive Error Flags and Transmit Operations (Synchronous Mode Only): Transmission
cannot be started when a receive error flag (ORER, PER, or FER) is set to 1, even if the TDRE
flag is cleared to 0. Be sure to clear the receive error flags to 0 before starting transmission.
Note also that receive error flags cannot be cleared to 0 even if the RE bit is cleared to 0.
Receive Data Sampling Timing and Receive Margin in Asynchronous Mode: In asynchronous
mode, the SCI operates on a base clock with a frequency of 16 times the transfer rate.
In reception, the SCI samples the falling edge of the start bit using the base clock, and performs
internal synchronization. Receive data is latched internally at the rising edge of the 8th pulse of the
base clock. This is illustrated in figure 14.21.
Rev.6.00 Sep. 27, 2007 Page 659 of 1268
REJ09B0220-0600
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