M68ICS08KX datasheet(32/77 Pages) MOTOROLA

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User’s Manual

M68ICS08KX In-Circuit Simulator

Support Information

MOTOROLA

Support Information

Depending on the connection, the MCU is used in one of three operating modes:

•

In the KXICS socket for programming and simple simulation

•

In the KXICS socket and connected to the target for emulation

•

On the target for MON08 debug operation

3.3 Level Translation

NOTE:

For the following discussion on the theory of operation of the KXICS, refer to

the schematic diagrams in Paragraph 3.6, Figures 3-1 to 3-6 of this section.

The KXICS has an operation voltage range of +2.0 to +5.0 volts while the host

development system interface is an RS-232 (COM) port. U12 on the ICS

converts 5-volt logic signals to RS-232 levels. ICS U10–U13 translate 5-volt

logic levels to the MCU operating voltage (2.0–3.3 volts).

3.4 KXICS Theory of Operation

NOTE:

For the following discussion on the theory of operation of the KXICS, refer to

the schematic diagrams in Paragraph 3.7.

3.4.1 Power Supply

Power input, J2, to the KXICS is via a standard DC power receptacle with a

2.5mm center pin. Input voltage is 5Vdc provided by a plug in the DC power

adapter.

The power is fused to prevent catastrophic failure by fuse F1 (5x20mm or 3AG

fuse).

CAUTION:

Always use a fuse of the proper current and voltage rating. Failure to do so can

result in serious equipment damage

In addition, the input line has a Transient Voltage Suppression (TVS) diode to

stop high voltage transients, including ESD events, from damaging the board.

A green LED is provided to indicate that 5VDC is being provided to the board,

with the ON/Off switch in the ON position. Power, however, is not available to

M68ICS08KX Datasheet(PDF) 32 Page - Motorola, Inc