Motorola M68EML08EY, User Manual, Page: 28 / 36

M68EML08EY Emulation Module - Version 1.0 User’s Manual
26 Support Information MOTOROLA
Support Information
3.5 Analog-to-Digital Converter Reference Voltage Connector E2
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
3.6 Board Factory Test Connector J6
Factory tests use this connector. It may not be populated.
3.7 Optional crystal circuit using Y1
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.
2 No connection
1 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).
Table 3-5 Connector J4 Signal Descriptions (Continued)
Pin Label Signal
E2
•
3 L
•
2 A/D REF
•
1 H
Table 3-6 Connector E2 Signal Descriptions
Pin Label Signal
3 L
LOW REFERENCE VOLTAGE
2 A/D REF No connection (label only)
1 H
HIGH REFERENCE VOLTAGE