HC05EVS CONFIGURATION AND OPERATION
3.1 SETTING F4EM JUMPER HEADERS
Your F4EM has FIVE jumper headers, J1 to J5. Sections 3.1 explain how to configure these
headers.
3.1.1 Clock Source Select Headers (J1, J2)
Jumper headers J1 and J2 determines the source of the clock signal. The diagram below
shows the factory configuration of these jumpers: the fabricated jumper between pins 2 and 3
selects the F4EM canned oscillator clock source.
MMDS
EM
J1
J2
TOSC1
(J1)
FABRICATED
JUMPERS
1
(2)
(3)
1
(2)
(3)
Jumper J2 can be used to select between an internal generated clock or a external clock
generated by the target system. If the target clock is selected by placing the jumper on J2
between pins 1 and 2 the position of the fabricated jumper on J1 does not matter.
NOTE: The only valid position of the J1 fabricated jumper is between pins 2 and 3 when
using the F4EM as part of an EVS system.
3.1.2 Clock Stretch Select Header(J3)
Jumper header J3 determines the source of clock stretching (if required). By default board is
shipped from the factory with no jumper installed. ie with the clock stretch funxtion disabled.
To enable clock stretch add jumper between pins 1 and 2 for DACIA cycle stretching (affects
locations $3FE0 - $3FE3) or between pin 2 and 3 for monitor map cycle stretching.
1
(2)
(3)
J3
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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