HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 473
HD6417144
Manufacturer Part Number
HD6417144
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417144.pdf
(930 pages)
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13.4.3
Either an internal clock generated by the on-chip baud rate generator or an external clock input at
the SCK pin can be selected as the SCI’s serial clock, according to the setting of the C/A bit in
SMR and the CKE1 and CKE0 bits in SCR. When an external clock is input at the SCK pin, the
clock frequency should be 16 times the bit rate used.
When the SCI is operated on an internal clock, the clock can be output from the SCK pin. The
frequency of the clock output in this case is equal to the bit rate, and the phase is such that the
rising edge of the clock is in the middle of the transmit data, as shown in figure 13.4.
The clock must not be stopped during operation.
SCK
TxD
Clock
Figure 13.4 Relation between Output Clock and Transmit Data Phase
0
D0
D1
D2
(Asynchronous Mode)
D3
D4
1 frame
D5
D6
13. Serial Communication Interface (SCI)
Rev.4.00 Mar. 27, 2008 Page 429 of 882
D7
0/1
1
1
REJ09B0108-0400
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