HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 418

• Manufacturer Part Number: HD6417706
• Description: Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

14.4
For serial communication, the SCI has an asynchronous mode in which characters are
synchronized individually, and a clock synchronous mode in which communication is
synchronized with clock pulses. Asynchronous/clock synchronous mode and the transmission
format are selected in SCSMR, as listed in table 14.8. The SCI clock source is selected by the
combination of the C/A bit in SCSMR and the CKE1 and CKE0 bits in SCSCR, as listed in table
14.9.
Asynchronous Mode:
Clock Synchronous Mode:
Rev. 4.00, 03/04, page 372 of 660
Data length is selectable: seven or eight bits.
Parity and multiprocessor bits are selectable. So is the stop bit length (one or two bits). The
combination of the preceding selections constitutes the communication format and character
length.
In receiving, it is possible to detect framing errors, parity errors , overrun errors and breaks.
An internal or external clock can be selected as the SCI clock source.
The transmission/reception format has a fixed eight-bit data length.
In receiving, it is possible to detect overrun errors.
An internal or external clock can be selected as the SCI clock source.
When an internal clock is selected, the SCI operates on the clock of the on-chip baud rate
generator, and can output a serial clock signal with a frequency matching the bit rate.
When an external clock is selected, the external clock input must have a frequency 16 times
the bit rate. (The on-chip baud rate generator is not used.)
When an internal clock is selected, the SCI operates on the clock of the on-chip baud rate
generator, and outputs a synchronous clock signal to external devices.
When an external clock is selected, the SCI operates on the input synchronous clock. The
on-chip baud rate generator is not used.
Operation