Motorola M68EM05P18, User Manual

Page: 21 / 56

MMDS/MMEVS Configuration and Operation
Setting M68EM05P18 Jumper Headers and Switches
M68EM05P18UM/D
MOTOROLA MMDS/MMEVS Configuration and Operation 21
Setting M68EM05P18 Jumper Headers and Switches
Your M68EM05P18 has two jumper headers — W1 and W2 — and an
8-position DIP switch, SW1, for the port A pullup/interrupt mask options.
Table 3 provides a quick reference for configuration options. Refer to the
paragraphs that follow for a more detailed explanation.
Table 3. Jumper Header and Switch Positions for MMDS/MMEVS
Jumper/
Switch
Position Description
Factory
Setting
Clock
Source
Select,
W1
Select the 4-MHz canned
oscillator located on the EM
board at XY1.
X
Select the clock originating from
the development system platform
board. The frequency is
controlled by the OSC command
and is 2 MHz on power up.
Selects a user supplied clock
source. The clock is input to
connector J2 through a target
cable assembly.
Reset
Select,
W2
Always in this position for MMDS
or MMEVS operation. Enables
software to control bidirectional
reset.
X
Not applicable on MMDS or
MMEVS
Port A
Interrupt
Mask
Option
Control,
SW1
Each port A bit is individually
configurable. In the left position,
the option is not selected.
X
In the right position, the option is
selected.
MMDS05
COMMON T_OSC1
CAN
MMDS05
COMMON
T_OSC1
CAN
MMDS05
COMMON
T_OSC1
CAN
TARGET
EVS
TARGET
EVS
PA0
PA7
ON
PORT A MASK
OPTION PULLUPS
TARGET
EVS
PA0
PA7
ON
PORT A MASK
OPTION PULLUPS