Jumper Header Types - Motorola M68MPB916R1 User Manual

Jumper Header
Type
two-pin with cut-trace
short
three-pin
Jumper
Header Type
1 2 3
W1 Jumper between pins 1 and 2 (factory default); selects the MPB on-board
crystal clock source.
Jumper between pins 2 and 3; selects an external clock source as the MCU
EXTAL input signal.
W2 Jumper installed or cut-trace short intact (factory default); selects the on-board
1
VDDA power source.
2
No jumper or cut-trace short; lets you connect an external power source to W2
pin 2 and the external-power-source ground to E1.
1 2 3
W3 Jumper installed on pins 1 and 2 (factory default); selects the MPB on-board
VRH power source.
Jumper installed on pins 2 and 3; selects an external VRH power source.
1 2 3
W4 Jumper installed on pins 1 and 2 (factory default); selects the MPB on-board
VRL power source.
Jumper installed on pins 2 and 3; selects an external VRL power source.
M68MPB16R1UM/D
Freescale Semiconductor, Inc.
Table 2-1. Jumper Header Types
Symbol
Two-pin jumper header with cut-trace short, designated WX,
where X = the jumper header number. If you cut the short, use a
fabricated jumper to return the jumper header to its factory default
state.
Three-pin jumper header, designated WX, where X = the jumper
header number. Use a fabricated jumper to create a connection
between two of the three pins of the jumper header.
Table 2-2. MPB Jumper Header Descriptions
Jumper header W2 is not populated by the factory.
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HARDWARE PREPARATION AND INSTALLATION
Description
Description
NOTE
2-3