MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
21-3
21.2
External Signal Description
This section provides a description of all module signals external to the MCU.
21.2.1
Overview
Each eSCI module has two I/O signals connected to the external MCU pins. These signals are summarized
in
and described in more detail in the following sections.
21.2.2
Detailed Signal Description
21.2.2.1
SCI Transmit (TXDx)
This pin serves as transmit data output of eSCI.
21.2.2.2
SCI Receive Pin (RXDx)
This pin serves as receive data input of the eSCI.
21.3
Memory Map/Register Definition
21.3.1
Overview
This section provides a detailed description of all memory and registers.
21.3.2
Module Memory Map
The memory map for the eSCI module is given below in
. The address offset is listed for each
register. The total address for each register is the sum of the base address for the eSCI module
(ESCI
x
_base) and the address offset for each register. There are two eSCI modules on the
MPC5553/MPC5554: the base is 0xFFFB_0000 for eSCIA and 0xFFFB_4000 for eSCIB.
Table 21-1. eSCI Signals
Signal Name
1
1
x indicates eSCI module A or B
I/O
Description
RXDx
I
eSCI Receive
TXDx
O
eSCI Transmit
Table 21-2. Module Memory Map
Address
Register Name
Register Description
Size (bits)
Base
0xFFFB_0000 (A)
0xFFFB_4000 (B)
ESCIx_CR1
eSCI control register 1
32
Base + 0x0004
ESCIx_CR2
eSCI control register 2
16
Base + 0x0006
ESCIx_DR
eSCI data register
16
Summary of Contents for MPC5553
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