DEMO908AP64 Freescale Semiconductor, DEMO908AP64 Datasheet - Page 9

• Manufacturer Part Number: DEMO908AP64
• Description: BOARD DEMO FOR 908AP64
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of DEMO908AP64

• Contents: Board, CDs, Cable, Filter
• Processor To Be Evaluated: MC68HC908AP
• Data Bus Width: 16 bit
• Interface Type: RS-232
• Silicon Manufacturer: Freescale
• Core Architecture: HC08
• Core Sub-architecture: HC08
• Silicon Core Number: MC68HC908
• Silicon Family Name: HC08AP
• Kit Contents: Demo Board, Cables, Software, Guides
• Rohs Compliant: No
• For Use With/related Products: MC68HC908AP Family
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

D E M O 9 0 8 A P 6 4
PWR_SEL Jumper
The PWR_SEL jumper selects the source of power input to the module, or allows regulated
+3.3VDC to be provided to J1 for use by external circuits. The module takes voltage input
from the 2-position on-board voltage regulator or from the 40-pin MCU connector (J1). Power
input at the terminal block must be DC voltage between +5VDC and +16VDC. Power input on
the MCU connector must be regulated voltage between +3.0VDC and +3.3VDC.
MCU_PORT connector power input allows use of batteries, or other alternate sources, to
power the module.
The PWR_SEL option jumper provides 3 possible configurations; source power from the PWR
connector, source power from J1, or source power from PWR and supply power to J1. The
figures below show the settings for each configuration.
Figure 2: PWR_SEL Jumper Settings
Reset Switch
The RESET switch provides a method to apply an asynchronous reset to the module. Press-
ing the RESET switch applies a low voltage level to the RST* input. A resistor tied to the high
voltage rail prevents spurious RESET input to the MCU. A capacitor tied to ground holds the
signal line low for a sufficient amount of time.
NOTE: Power output from the module is limited by the 250 mA maximum output
CAUTION: Module damage may occur if the MCU_PORT power input pin (J1-1)
NOTE: Power output from the module is limited by the 250 mA maximum out-
1
2
1
2
1
2
of the on-board voltage regulator.
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put of the on-board voltage regulator.
is over-driven.
Module powered from external +3.0VDC - +3.3VDC input con-
nected to J1-1 (+) and J1-3 (-)
Module powered from external +5VDC - +16VDC connected to
TB1 Terminal Block. J1-1 is open or not connected.
Module powered from external +5VDC - +16VDC connected to
TB1 Terminal Block. Module provides +3.3VDC output (up to 50
mA) at pin J1 for use by external circuits.
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J U N E
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2 0 0 4
The