HD64F7144F50V Datasheet, PDF (833/932 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

26. Electrical Characteristics
[Operating Precautions]
The inputs and outputs are asynchronous in asynchronous mode, but as shown in figure 26.20, the
received data is considered to have been changed at CK clock rise (two-clock intervals). The
transmit signals change with a reference of CK clock rise (two-clock intervals).
SCK0 to SCK3
t_sckw
V_IH
V_IH
V_IL
t_sckr
V_IH
V_IL
t_scyc
t_sckf
V_IH
V_IL
Figure 26.19 SCI Input Timing
SCI input/output timing (clock synchronous mode)
t_scyc
SCK0 to SCK3
(input/output)
t_TxD
TxD0 to TxD3
(transmit data)
RxD0 to RxD3
(received data)
t_RxS t_RxH
SCI input/output timing (asynchronous mode)
T₁
V_OH
CK
t_TxD
TxD0 to TxD3
(transmit data)
RxD0 to RxD3
(received data)
T_n
V_OH
t_RxS t_RxH
Figure 26.20 SCI Input/Output Timing
Rev.4.00 Mar. 27, 2008 Page 787 of 882
REJ09B0108-0400