Table of Contents
Advertisement
Chapter 22
Serial Communications Interface (SCI)
22.1 Chip specific serial communications interface
This device includes one independent serial communications interface (SCI) module.
Typically, these systems are used to connect to the RS232 serial input/output port of a
personal computer or workstation. They can also be used to communicate with other
embedded controllers.
A flexible, 13-bit, modulo-based baud rate generator supports a broad range of standard
baud rates beyond 115.2 kBD. Programmable 8-bit or 9-bit format and 1-bit or 2-bit Stop
are supported.
This SCI system offers many advanced features not commonly found on other
asynchronous serial I/O peripherals of the embedded controllers. The receiver employs an
advanced data sampling technique that ensures reliable communication and noise
detection. Hardware parity, receiver wakeup, and double buffering on transmit and
receive are also included.
SCI has option to be either continuously clocked or frozen in Wait mode. It is controlled
by SC1_C1[SCISWAI].
• SC1_C1[SCISWAI] = 0: SCI clocks continue to run in Wait mode so the SCI can be
the source of an interrupt that wakes the CPU
• SC1_C1[SCISWAI] = 1: SCI clocks freeze when CPU is in Wait mode.
Customization:
• Primary clock: BUSCLK (20 MHz)
• Alternate clock: None
NXP Semiconductors
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
395
Advertisement
Table of Contents
