HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 423
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HD6413008F
Manufacturer Part Number
HD6413008F
Description
Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6413008F.pdf
(686 pages)
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Break Detection and Processing: Break signals can be detected by reading the RxD pin directly
when a framing error (FER) is detected. In the break state the input from the RxD pin consists of
all 0s, so the FER flag is set and the parity error flag (PER) may also be set. In the break state the
SCI receiver continues to operate, so if the FER flag is cleared to 0 it will be set to 1 again.
Sending a Break Signal: The input/output condition and level of the TxD pin are determined by
DR and DDR bits. This feature can be used to send a break signal.
After the serial transmitter is initialized, the DR value substitutes for the mark state until the TE
bit is set to 1 (the TxD pin function is not selected until the TE bit is set to 1). The DDR and DR
bits should therefore be set to 1 beforehand.
To send a break signal during serial transmission, clear the DR bit to 0 , then clear the TE bit to 0.
When the TE bit is cleared to 0 the transmitter is initialized, regardless of its current state, so the
TxD pin becomes an input/output outputting the value 0.
Receive Error Flags and Transmitter Operation (Synchronous Mode Only): When a receive
error flag (ORER, PER, or FER) is set to 1 the SCI will not start transmitting, even if the TDRE
flag is cleared to 0. Be sure to clear the receive error flags to 0 when starting to transmit. Note that
clearing the RE bit to 0 does not clear the receive error flags to 0.
Receive Data Sampling Timing in Asynchronous Mode and Receive Margin: In asynchronous
mode the SCI operates on a base clock with 16 times the bit rate frequency. In receiving, the SCI
synchronizes internally with the fall of the start bit, which it samples on the base clock. Receive
data is latched at the rising edge of the eighth base clock pulse. See figure 12.21.
Internal base clock
Receive data
(RxD)
Synchronization
sampling timing
Data sampling
timing
Figure 12.21 Receive Data Sampling Timing in Asynchronous Mode
0
Start bit
8 clocks
16 clocks
7
15 0
Rev.4.00 Aug. 20, 2007 Page 379 of 638
12. Serial Communication Interface
D
0
7
REJ09B0395-0400
15 0
D
1
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