SH7708 Datasheet, PDF (442/633 Pages) Renesas Technology Corp – SuperH™ RISC engine

Figures 15.2 to 15.4 show block diagrams of the SCI I/O port.
MD0/SCK
Reset
R
QD
SPB1IO
C
SPTRW
Reset
R
QD
SPB1DT
C
SPTRW
Internal data bus
SCI
Clock output enable
Serial clock output
Serial clock input
*
Clock input enable
SPTRR
SPTRW: SPTR write
SPTRR: SPTR read
Note: * Signals that set the SCK pin function to internal clock output or external clock
input as specified by the CKE0 and CKE1 bits in SCSCR, and the C/A bit in
SCSMR.
Figure 15.2 SCI I/O Port: MD0/SCK Pin
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