User`s manual

HARDWARE PREPARATION AND INSTALLATION
2-4 MPC505EVBUM/D
Table 2-2. MPFB Jumper Header Descriptions (continued)
Jumper
Header Type Description
J4
Keep alive
power 1 select
header
3 2 1
Jumper installed on pins 1 and 2 (factory default); MCU-internal oscillator,
time base, and decrementer operates as long as power is applied to the
EVB (+3.3 Vdc present on the VKAPWR2 pin of the MCU).
+3.3 Vdc external power supply attached to jumper header J4 pins 2 and 3;
maintains MCU-internal oscillator, time base, and decrementer operates
after EVB power is turned OFF.
J5 Unused
J6,
System clock
selection
header
3
2
1
Jumper installed on pins 1 and 2 (factory default); jumper headers J6 and
J7 select the MCU clock mode. The state of this signal during reset selects
the source of the system clock.
J7
System clock
selection
header
3
2
1
Jumper installed on pins 1 and 2 (factory default); jumper headers J6 and
J7 select the MCU clock mode.