R5F61525 RENESAS [Renesas Technology Corp], R5F61525 Datasheet - Page 446

• Manufacturer Part Number: R5F61525
• Description: 32-Bit CISC Microcomputer H8SX Family H8SX/1500 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 12 Serial Communication Interface (SCI)
12.4.3
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 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 12.4.
Rev. 3.00 Mar. 14, 2006 Page 408 of 804
REJ09B0104-0300
SCK
TxD
Clock
Figure 12.4 Phase Relation between Output Clock and Transmit Data
0
D0
D1
D2
(Asynchronous Mode)
D3
D4
1 frame
D5
D6
D7
0/1
1
1