MSC8113 Reference Manual, Rev. 0
Freescale Semiconductor
21-1
UART
21
The UART, also known as the serial communication interface (SCI), is a full-duplex port for
serial communications with other devices. This interface uses two dedicated signals: transmit
data (
UTXD
) and receive data (
URXD
) (see Figure 21-1). The external connections shared by these
signals with
GPIO[27–28]
are available as general-purpose I/O (GPIO) signals when they are not
configured for UART operation.
The UART is accessible, via the IPBus, to an external host or to each of the SC140 cores. An
external host accesses the IPBus via the local bus, and each SC140 core accesses the IPBus via
the SQBus.
The UART generates one interrupt signal that connects to each of the SC140 core LICs so that
each SC140 core can service UART interrupts. The UART interrupt signal also connects to the
GIC, which drives
INT_OUT
so that an external host using interrupts on
INT_OUT
signal can service
UART interrupts. For details on UART interrupt signal connectivity to LICs and GIC, refer to
Chapter 17, Interrupt Processing. When accepting an interrupt request, an SC140 core or
external host should read the UART status register (SCISR) to identify the interrupt source and
service it accordingly. During reception, the UART generates an interrupt request when a new
character is available to the UART data register, SCI Data Register (SCIDR). An SC140 core or
external host then reads the character from the data register. During transmission, the UART
generates an interrupt request when its data register can be written with new character. An SC140
core or external host then writes the character to the data register.
Figure 21-1. UART Interface
SCI
URXD
UTXD
UART
Interrupt
Request to GIC and 4 LICs
IPBus
Summary of Contents for MSC8113
Page 1: ...MSC8113 Reference Manual Tri Core 16 Bit Digital Signal Processor MSC8113RM Rev 0 May 2008 ...
Page 20: ...MSC8113 Reference Manual Rev 0 xx Freescale Semiconductor Contents ...
Page 28: ...MSC8113 Reference Manual Rev 0 xxviii Freescale Semiconductor ...
Page 56: ...MSC8113 Reference Manual Rev 0 1 28 Freescale Semiconductor MSC8113 Overview ...
Page 76: ...MSC8113 Reference Manual Rev 0 2 20 Freescale Semiconductor SC140 Core Overview ...
Page 134: ...MSC8113 Reference Manual Rev 0 4 30 Freescale Semiconductor System Interface Unit SIU ...
Page 168: ...MSC8113 Reference Manual Rev 0 6 18 Freescale Semiconductor Boot Program ...
Page 180: ...MSC8113 Reference Manual Rev 0 7 12 Freescale Semiconductor Clocks ...
Page 260: ...MSC8113 Reference Manual Rev 0 8 80 Freescale Semiconductor Memory Map ...
Page 300: ...MSC8113 Reference Manual Rev 0 9 40 Freescale Semiconductor Extended Core ...
Page 304: ...MSC8113 Reference Manual Rev 0 10 4 Freescale Semiconductor MQBus and M2 Memory ...
Page 308: ...MSC8113 Reference Manual Rev 0 11 4 Freescale Semiconductor SQBus ...
Page 590: ...MSC8113 Reference Manual Rev 0 17 46 Freescale Semiconductor Interrupt Processing ...
Page 614: ...MSC8113 Reference Manual Rev 0 18 24 Freescale Semiconductor Debugging ...
Page 622: ...MSC8113 Reference Manual Rev 0 19 8 Freescale Semiconductor Internal Peripheral Bus IPBus ...
Page 724: ...MSC8113 Reference Manual Rev 0 21 32 Freescale Semiconductor UART ...
Page 920: ...MSC8113 Reference Manual Rev 0 25 150 Freescale Semiconductor Ethernet Controller ...
Page 1171: ...MSC8113 Reference Manual Rev 0 Freescale Semiconductor C 61 EF wait_rts P 01077FFC 9F rts 71 ...
Page 1172: ...MSC8113 Reference Manual Rev 0 C 62 Freescale Semiconductor MSC8113 Boot Code ...
Page 1202: ...MSC8113 Reference Manual Rev 0 Index 30 Freescale Semiconductor Index ...