MCCIRM Freescale Semiconductor / Motorola, MCCIRM Datasheet - Page 58

• Manufacturer Part Number: MCCIRM
• Description: MCCIRM Multi-Channel Communications Interface Reference Manual
• Manufacturer: Freescale Semiconductor / Motorola

SCI Submodule
5.2 Introduction
Reference Manual
58
5.8
5.8.1
5.8.2
5.8.3
5.8.4
The SCI submodule contains two independent SCI systems. Each is a
full-duplex universal asynchronous receiver transmitter (UART). This
SCI system is fully compatible with SCI systems found on other Motorola
devices, such as the M68HC11 and M68HC05 Families.
The SCI uses a standard non-return-to-zero (NRZ) transmission format.
An on-chip baud-rate generator derives standard baud-rate frequencies
from the MCU oscillator. Both the transmitter and the receiver are double
buffered, so that back-to-back characters can be handled easily even if
the CPU is delayed in responding to the completion of an individual
character. The SCI transmitter and receiver are functionally independent
but use the same data format and baud rate.
SCI operation can be polled by means of status flags in the SCI status
register (SCSR), or interrupt-driven operation can be employed by
means of the interrupt-enable bits in SCI control register 1 (SCCR1).
The two independent SCI systems are called SCIA and SCIB. These
SCIs are identical in register set and hardware configuration, providing
an application with full flexibility in using the dual SCI system.
References to SCI registers in this section do not always distinguish
between the two SCI systems. A reference to SCCR1, for example,
applies to both SCCR1A (SCIA control register 1) and SCCR1B (SCIB
control register 1).
Table 5-1
in this section. All registers, bits, and fields referred to are discussed fully
later in this section or in
to
the names, mnemonics, and address offsets of registers involved in SCI
operation.
Table 1-1. MCCI Memory Map
Freescale Semiconductor, Inc.
For More Information On This Product,
SCI Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
SCI Control Register 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
SCI Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
SCI Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
SCI Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
is a quick reference guide to all the bits and fields referred to
Go to: www.freescale.com
SCI Submodule
Section 3. Configuration and
Multichannel Communication Interface — Rev. 1.0
(the MCCI memory map) for a list of
Control. Refer
MOTOROLA