
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
Freescale Semiconductor
145
Chapter 11
Serial Communications Interface (S08SCIV1)
11.1
Introduction
The MC9S08RDxx, MC9S08RExx, and MC9S08RGxx devices include a serial communications interface
(SCI) module, which is sometimes called a universal asynchronous receiver/transmitters (UART). The SCI
module shares pins with PTB0 and PTB1 port pins. When the SCI is enabled, the pins are controlled by
the SCI module.
Figure 11-1 is a device-level block diagram with the SCI highlighted.