HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 447
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HD64F7050
Manufacturer Part Number
HD64F7050
Description
32-Bit RISC Microcomputer SuperH RISC engine Family/
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD64F7050.pdf
(841 pages)
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13.5.3
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 FER 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 bit is cleared to 0, it will be set to 1 again.
13.5.4
The TxD pin becomes a general I/O pin with the I/O direction and level determined by the I/O port
data register (DR) and pin function controller (PFC) control register (CR). These conditions allow
break signals to be sent. The DR value is substituted for the marking status until the PFC is set.
Consequently, the output port is set to initially output a 1. To send a break in serial transmission,
first clear the DR to 0, then establish the TxD pin as an output port using the PFC. When TE is
cleared to 0, the transmission section is initialized regardless of the present transmission status.
13.5.5
When a receive error flag (ORER, PER, or FER) is set to 1, the SCI will not start transmitting
even if TDRE is set to 1. Be sure to clear the receive error flags to 0 before starting to transmit.
Note that clearing RE to 0 does not clear the receive error flags.
13.5.6
In the asynchronous mode, the SCI operates on a base clock of 16 times the bit rate frequency. In
receiving, the SCI synchronizes internally with the falling edge of the start bit, which it samples
on the base clock. Receive data is latched on the rising edge of the eighth base clock pulse (figure
13.23).
Break Detection and Processing
Sending a Break Signal
Receive Error Flags and Transmitter Operation (Clock Synchronous Mode Only)
Receive Data Sampling Timing and Receive Margin in the Asynchronous Mode
Section 13 Serial Communication Interface (SCI)
Rev. 5.00 Jan 06, 2006 page 427 of 818
REJ09B0273-0500
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