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H8SX/1663 데이터시트(PDF) 753 Page - Renesas Technology Corp

부품명 H8SX/1663
상세설명  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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Section 15 Serial Communication Interface (SCI, IrDA, CRC)
Rev.1.00 Jun. 07, 2006 Page 701 of 1102
REJ09B0294-0100
15.4.3
Clock
Either an internal clock generated by the on-chip baud rate generator or an external clock input to
the SCK pin can be selected as the SCI's transfer 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 to the SCK pin, the
clock frequency should be 16 times the bit rate (when ABCS
= 0) and 8 times the bit rate (when
ABCS
= 1).
In addition, when an external clock is specified, the average transfer rate or the base clock of
TMR_4 to TMR_7 can be selected by the ACS3 to ACS0 bits in SEMR_5 and SEMR_6.
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 15.7.
0
1 frame
D0
D1
D2
D3
D4
D5
D6
D7
0/1
11
SCK
TxD
Figure 15.7 Phase Relation between Output Clock and Transmit Data
(Asynchronous Mode)



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