mpc5644a Freescale Semiconductor, Inc, mpc5644a Datasheet - Page 67

• Manufacturer Part Number: mpc5644a
• Description: Mpc5644a Microcontroller Data Sheet
• Manufacturer: Freescale Semiconductor, Inc

EVTO
MCKO
MDO[0:11]
MSEO[0:1]
RDY
BOOTCFG[0:1]
Signal
Nexus
Nexus
Nexus
Nexus
Nexus
SIU - Configuration
Module or Function
Table 5. Signal details (continued)
Output that provides timing to a development tool for a single
watchpoint or breakpoint occurrence.
MCKO is a free running clock output to the development tools
which is used for timing of the MDO and MSEO signals.
Trace message output to development tools. This pin also
indicates the status of the crystal oscillator clock following a
power-on reset, when MDO[0] is driven high until the crystal
oscillator clock achieves stability and is then negated.
Output pin—Indicates the start or end of the variable length
message on the MDO pins
Nexus Ready Output (RDY) is an output that indicates to the
development tools the data is ready to be read from or written to
the Nexus read/write access registers.
Two BOOTCFG signals are implemented in MPC5644A MCUs.
The BAM program uses the BOOTCFG0 bit to determine where
to read the reset configuration word, and whether to initiate a
FlexCAN or eSCI boot.
The BOOTCFG1 pin is sampled during the assertion of the
RSTOUT signal, and the value is used to update the RSR and
the BAM boot mode
See the MPC5644A Microcontroller Reference Manual for more
information.
The following values are for BOOTCFG[0:1}:
00:Boot from internal flash memory
01:FlexCAN/eSCI boot
10:Boot from external memory using EBI
11:Reserved
Note: For the 176-pin QFP and 208-ball BGA packages
BOOTCFG[0] is always 0 since the EBI interface is not available.
Description