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Table 3-5 Connector J4 Signal Descriptions (Continued)
Pin
2
1
3.5 Analog-to-Digital Converter Reference Voltage Connector E2
Pin
3
2
1
3.6 Board Factory Test Connector J6
3.7 Optional crystal circuit using Y1
M68EML08EY Emulation Module - Version 1.0
26
Label
No connection
OSC2
INVERTED CLOCK OUTPUT — Inversion of the clock signal that
jumper header W4 specifies if you select the external clock. Inversion of
the ICG clock if you select the internal clock (default).
Connector E2 is the source for the filtered A/D reference voltages. Figure 3-6
and Table 3-6 give the pin assignments and signal descriptions for this
connector. The factory test uses this connection.
Figure 3-6 Connector E2 Pin Assignments
Table 3-6 Connector E2 Signal Descriptions
Label
L
LOW REFERENCE VOLTAGE
A/D REF
No connection (label only)
HIGH REFERENCE VOLTAGE
H
Factory tests use this connector. It may not be populated.
When you select the XTAL option on jumper W4 (jumper on pins 5-6), the
clock signal generated by Y1 is supplied to the external inputs of the MCU. The
circuit that uses crystal Y1 is not populated in production. You can populate this
circuit using the default values supplied in the schematic (see page 6). This
circuit does not necessarily represent a crystal attached to the MCU.
Support Information
Signal
E2
•
3
L
•
2
A/D REF
•
1
H
Signal
User's Manual
MOTOROLA
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