DEMO9S08SH8 Freescale Semiconductor, DEMO9S08SH8 Datasheet - Page 11

• Manufacturer Part Number: DEMO9S08SH8
• Description: BOARD DEMO FOR MC9S08SH FAM
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S08SH8

• Contents: Board, Cable, CD
• Processor To Be Evaluated: MC9S08SH4 and MC9S08SH8
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Silicon Manufacturer: Freescale
• Core Architecture: HCS08
• Core Sub-architecture: HCS08
• Silicon Core Number: MC9S08
• Silicon Family Name: S08SH
• Kit Contents: Board
• Rohs Compliant: Yes
• For Use With/related Products: MC9S08SH4, MC9S08SH8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

D E M O 9 S 0 8 S H 8
A P R I L
2 7 ,
2 0 0 7
U S E R
G U I D E
Figure 3: VX_EN Option Header
ON
OFF
1
2
Enabled
Disabled
VX_EN
CAUTION: Do not exceed available current supply from USB-Multilink BDM or on-board regu-
lator, when sourcing power through connector J1 to external circuitry.
RESET SWITCH
The RESET switch applies an asynchronous RESET to the MCU. The RESET switch is con-
nected directly to the RESET* input on the MCU. Pressing the RESET switch applies a low
voltage level to the RESET* input. A pull-up bias resistor allows normal MCU operation.
Shunt capacitance ensures an adequate input pulse width.
LOW VOLTAGE RESET
The MC9S08SH8 utilizes an internal Low Voltage Detect (LVD) circuit. The LVD holds the
MCU in reset until applied voltage reaches an appropriate level. The LVD also protect against
under-voltage conditions. Consult the MC9S08SH8 reference manual for details LVD opera-
tion.
TIMING
The DEMO9S08SH8 is configured to use the target MCU’s internal clock source by default.
Space is provided for an external, 32 kHz XTAL oscillator; however, this timing source is not
populated. The internal timing source is active out of RESET. Default configuration sets the
internal bus to run at 8.4MHz. The internal clock source is trimmable to ± 0.2%. Refer to the
MC9S08SH8 Data Sheet for further details.
COMMUNICATIONS
The DEMO9S08SH8 board applies a single Serial Communications Interface (SCI) port con-
figurable between either SCI or LIN functionality. RS-232 communications are supported
through a DB9 connector. LIN communications are supported through associated pins at con-
nector J1. An option header at COM_EN allows the user to isolate the RS-232 transceiver
from the MCU. This allows the associated MCU pins to be used for alternate functionality.
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