HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 436
HD6417034B
Manufacturer Part Number
HD6417034B
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417034B.pdf
(687 pages)
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Section 13 Serial Communication Interface (SCI)
Constraints on DMAC Use:
Cautions on Use of Synchronous External Clock Mode:
Caution on Synchronous Internal Clock Mode: When receiving, RDRF is set to 1 when RE is
cleared to 0 1.5 clocks after the rising edge of the RxD D7 bit SCK output, but copying to RDR is
not possible.
Rev. 7.00 Jan 31, 2006 page 410 of 658
REJ09B0272-0700
Note: During external clock operation, an error may occur if t is 4 or less.
When using an external clock source for the serial clock, update TDR with the DMAC, and
then input the transmit clock after the elapse of five system clocks or more. If a transmit clock
is input in the first four system clocks after TDR is written, an error may occur (figure 13.22).
Before reading the receive data register (RDR) with the DMAC, select the receive-data-full
interrupt of the SCI as an activation source using the resource select bit (RS) in the channel
control register (CHCR).
Set TE = RE = 1 only when the external clock SCI is 1.
Do not set TE = RE = 1 until at least 4 clocks after the external clock SCK has changed from 0
to 1.
When receiving, RDRF is set to 1 when RE is cleared to 0 2.5–3.5 clocks after the rising edge
of the RxD D7 bit SCK input, but copying to RDR is not possible.
TDRE
SCK
Figure 13.22 Example of Synchronous Transmitting with DMAC
t
D0
D1
D2
D3
D4
D5
D6
D7
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