User`s manual

HARDWARE PREPARATION AND INSTALLATION
MPC505EVBUM/D 2-3
Table 2-1. Jumper Header Types
Jumper Header
Type Symbol Description
two-pin with solder
strap
Two-pin plate through holes (without jumper header block) and
designated as JX (X = the jumper header number). Bus wire
soldered between the two pins of the plate through holes to
create a short.
two-pin Two-pin jumper header and designated as JX (X = the jumper
header number). Use a fabricated jumper to create a short
between the two pins of the jumper header.
two-pin with jumper Two-pin jumper header with jumper, designated as JX (X = the
jumper header number).
three-pin Three-pin jumper header, designated as JX (X = the jumper
header number). Use a fabricated jumper to create a short
between two of the three pins of the jumper header.
three-pin with jumper Three-pin jumper header with jumper and designated as JX (X =
the jumper header number). To change the factory jumper header
configuration, move the jumper to the two desired pins.
Table 2-2. MPFB Jumper Header Descriptions
Jumper
Header Type Description
J1
Crystal clock
sourcr select
header
(XTAL)
2 1
Bus wire soldered between pins 1 and 2 (factory default); selects the EVB
on-board 4 MHz crystal clock source.
Bus wire between pins 1 and 2 is removed; lets you select an external
clock source as the MCU EXTAL input signal.
J2
Clock
oscillator
source select
header
(EXTAL)
3 2 1
Bus wire between pins 1 and 2; lets you select an crystal oscillator clock
source as the MCU EXTAL input signal. (You must remove the bus wire
between pins 1 and 2 on
Bus wire soldered between pins 2 and 3 (factory default); selects the EVB
on-board 4 MHz crystal clock source.
J3
Keep alive
power 2 select
header
3 2 1
Jumper installed on pins 1 and 2 (factory default); keep alive power 2 is
active 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 pins 2 and 3; maintains MCU-
internal RAM after EVB power is turned OFF.