HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 508

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

13. Serial Communication Interface (SCI)
When the TE bit is cleared to 0, the transmission section is initialized regardless of the present
transmission status.
13.9.5
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.
13.9.6
1. When using an external clock source for the serial clock, update TDR with the DMAC or the
2. Before reading the receive data register (RDR) with the DMAC or the DTC, select the receive-
13.9.7
1. Set TE = RE = 1 only when external clock SCK is 1.
2. Do not set TE = RE = 1 until at least four Pφ clocks after external clock SCK has changed
3. When receiving, RDRF is 1 when RE is cleared to 0 after 2.5 to 3.5 Pφ clocks from the rising
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REJ09B0108-0400
DTC, and then after the elapse of five peripheral clocks (Pφ) or more, input a transmit clock. If
a transmit clock is input in the first four Pφ clocks after TDR is written, an error may occur
(figure 13.30).
data-full (RXI) interrupt of the SCI as a start-up source.
from 0 to 1.
edge of the RxD D7 bit SCK input, but copying to RDR is not possible.
Figure 13.30 Example of Clocked Synchronous Transmission with DMAC/DTC
Receive Error Flags and Transmit Operations (Clocked Synchronous Mode Only)
Notes on DMAC and DTC Use
Notes on Clocked Synchronous External Clock Mode
Note: During external clock operation, an error may occur if t is 4 Pφ clocks or less.
SCK
TDRE
t
D0
D1
D2
D3
D4
D5
D6
D7