H8S2110B RENESAS [Renesas Technology Corp], H8S2110B Datasheet - Page 278

• Manufacturer Part Number: H8S2110B
• Description: Renesas 16-Bit Single-Chip Microcomputer Renesas H8S Family/H8S/2100 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 at
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 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 12.4.
Rev. 2.00 Mar 21, 2006 page 240 of 518
REJ09B0299-0200
SCK
TxD
Clock
Figure 12.4 Relation between Output Clock and Transmit Data Phase
0
D0
D1
D2
(Asynchronous Mode)
D3
D4
1 frame
D5
D6
D7
0/1
1
1