Renesas SH7781 - Manual (Page 1114)

21. Serial Communication Interface with FIFO (SCIF)
Rev.1.00 Jan. 10, 2008 Page 1084 of 1658
REJ09B0261-0100
5. When modem control is enabled, the
SCIF_RTS signal is output when SCFRDR is empty.
When
SCIF_RTS is 0, reception is possible. When SCIF_RTS is 1, this indicates that
SCFRDR contains bytes of data equal to or more than the
SCIF_RTS output active trigger
count. The
SCIF_RTS output active trigger value is specified by bits 10 to 8 in SCFCR. For
details, see section 21.3.9, FIFO Control Register n (SCFCR). In addition,
SCIF_RTS is also 1
when the RE bit in SCSCR is cleared to 0.
Figure 21.14 shows an example of the operation when modem control is used.
D0 D1 D2 D7 0/1 1 0 0
Serial data
SCIF_RXD
SCIF_RTS
Start
bit Parity
bit Stop
bit Start
bit
Figure 21.14 Example of Operation Using Modem Control (
SCIF_RTS)
(Only in Channels 1 and 2)