
HC05EVS CONFIGURATION AND OPERATION
M68EM05D32/D
3-2
MOTOROLA
3.1.1 Clock Source Select Headers (J2 and J3)
Jumper headers J2 and J3 select the source of the clock oscillator for the MCU. You may
choose between on-board oscillator (EM) or clock from the target system (TOSC). To select
TRGT you must place the J3 jumper at the (J2) position as well as selecting TRGT on the J2
jumper. The diagram below shows the factory configuration: the fabricated jumper on J3
between pins 1 and 2 selects the D32EM on-board canned oscillator clock source.
FABRICATED
JUMPERS
XTAL
(J2)
J3
1
(2)
(3)
TRGT
MMDS
J2
1
(2)
(3)
NOTE
The J2 pins 2-and-3 configuration is not correct for a D32EM that is part of an
HC05EVS system.