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MMDS/MMEVS Configuration and Operation
Port D
Source Select
Header, W2
Mode Select
Header, W3
20
Freescale Semiconductor, Inc.
The port D source header controls the muxed mode port D source for the
M68EM05C0 emulation module. The proper configuration for this
jumper is determined by the version of MC68HC05C0 silicon used as the
resident MCU and installed in the XU11 socket on the M68EM05C0
board.
For first pass silicon, the port D I/O logic is rebuilt external to the MCU
using a port replacement unit (PRU). The W2 jumper should be in the
PRU position. In this position, the port D keyscan interrupts feature is not
available in emulation.
For later versions of silicon, the emulator uses port D I/O logic on the
resident MCU. The W2 jumper should be in the MCU position. The
keyscan interrupts feature is supported with this configuration.
Jumper header W3 controls the mode the resident MC68HC05C0 MCU
will operate in. When the jumper is installed, the MCU will come out of
reset in muxed mode. The data is multiplexed with the lower order
address bits in this mode.
Non-muxed mode is entered out of reset if the jumper is removed from
the header. In this mode, address and data have individual, separate
lines.
W3
MMDS/MMEVS Configuration and Operation
For More Information On This Product,
Go to: www.freescale.com
Setting M68EM05C0 Jumper
MUXED MODE
PORT D SOURCE
MCU
W2
PRU
FABRICATED
JUMPER
FABRICATED
JUMPER
MODE
IN = MUX
OUT = NMUX
M68EM05C0UM/D
MOTOROLA
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