Operation In Ssb Mode; Figure 10.3 Example Of Ssb Connections - Renesas H8/3847R Series Hardware Manual

8-bit single-chip microcomputer super low power

Table of Contents

Operation in SSB Mode

SSB communication uses two lines, SCL (Serial Clock) and SDA (Serial Data), and enables a

number of ICs to be controlled when connected as shown in figure 10.3.

In SSB mode, a tail mark is attached and transmitted following an 8-bit or 16-bit data transfer.

Either HOLD TAIL or LATCH TAIL can be selected as the tail mark.

The serial clock can be selected from 8 internal clocks or an external clock, but since the H8/3847

Group chip provides the clock output, an external clock should not be selected. The transfer rate

can be selected with bits CKS2 to CKS0 in SCR1; since this is also the tail mark transfer rate, the

setting should provide for a serial clock cycle of at least 2 µs.

2. Data Transfer Format

The SCI1 transfer format is shown in figure 10.4. LSB-first transfer is used (i.e. transmission is

performed starting with the least significant bit of the transfer data). A tail mark is added after an

8-bit or 16-bit transfer.

Section 10 Serial Communication Interface

Rev. 6.00 Aug 04, 2006 page 343 of 680

REJ09B0145-0600