CSM-12C32 AXIOM, CSM-12C32 Datasheet - Page 8

• Manufacturer Part Number: CSM-12C32
• Description: MCU MODULE
• Manufacturer: AXIOM

Specifications of CSM-12C32

• Silicon Manufacturer: Freescale
• Core Architecture: HCS12
• Core Sub-architecture: S12C
• Features: Power Selection Jumper, Analog Comparator, SCI/SPI Communications Ports
• Kit Contents: Board, Cables, CD, Power Supply
• Silicon Core Number: MC9S12C32
• Silicon Family Name: S12C

C S M 1 2 C 3 2
U S E R
PWR_SEL Jumper
The PWR_SEL jumper is a 4-position option header that configures power routing on the
CSM12C32 module. The module may be powered by an external transformer connected to
the PWR connector or through connector J1. The module may also source power to auxiliary
modules connected to the connector J1. Damage may occur if the J1 power input pins are
over-driven. Refer to Figure 1 below to determine correct PWR_SEL jumper setting.
Figure 1: PWR_SEL
Reset Switch
The RESET switch provides an asynchronous reset input to the MCU. Pressing the RESET
switch produces a low-voltage level on the RESET input to the MCU. The low-voltage supervi-
sor (LV1) holds the RESET line low for approximately 150 ms after the pushbutton is released.
Low-Voltage Detect
A DS1813 (LV1) provides POR, low-voltage detect, and pushbutton reset services for the
module. At power-on, LV1 holds the MCU in reset for 150 ms after V
4.35V. During normal operation, LV1 asserts RESET when V
RESET true for 150 ms after VCC returns to normal. The push-button operation is described
in the paragraph above. Use of connector J1 to supply +3.3V to the module requires disabling
LV1.
LV1 may be disabled by opening the cut-trace CT1. Simply remove the circuit trace between
the cut-trace pads to open the circuit. To restore the circuit functionality, install a 1206 size, 0-
ohm, resistor or a short piece of wire across the cut-trace pads.
Timing
A ceramic resonator (Y1) provides a 16.0 MHz base operating frequency to the MCU. This
supports a default 8.0 MHz internal operating frequency. Higher frequencies are possible us-
ing the embedded PLL. The resonator output is routed to the MCU only and is not available at
the MCU Port connector (J1). The MCU ECLK output is available to the user at connector J1 if
enabled.
G U I D E
1
2
1
2
1
2
Source power input from barrel connector PWR.
Source power input from connector J1.
Source power from barrel connector PWR and supply power to external cir-
cuitry connected to J1.
8
CC
falls below 4.35V and holds
CC
reaches approximately
A U G U S T
1 ,
2 0 0 8