h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 527
h8s-2635
Manufacturer Part Number
h8s-2635
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2635.pdf
(1547 pages)
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Clock: 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/
bit in SMR and the CKE1 and CKE0 bits in SCR. For details of SCI clock source selection, see
table 13-9.
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 13-3.
Data Transfer Operations:
SCI initialization (asynchronous mode)
Before transmitting and receiving data, you should first clear the TE and RE bits in SCR to 0,
then initialize the SCI as described below.
When the operating mode, transfer format, etc., is changed, the TE and RE bits must be cleared
to 0 before making the change using the following procedure. When the TE bit is cleared to 0,
the TDRE flag is set to 1 and TSR is initialized. Note that clearing the RE bit to 0 does not
change the contents of the RDRF, PER, FER, and ORER flags, or the contents of RDR.
When an external clock is used the clock should not be stopped during operation, including
initialization, since operation is uncertain.
0
Figure 13-3 Relation between Output Clock and Transfer Data Phase
D0
D1
D2
D3
(Asynchronous Mode)
D4
1 frame
D5
Section 13 Serial Communication Interface (SCI)
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Rev. 6.00 Feb 22, 2005 page 467 of 1484
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