TWR-MCF51JF-KIT Freescale Semiconductor, TWR-MCF51JF-KIT Datasheet - Page 8

• Manufacturer Part Number: TWR-MCF51JF-KIT
• Description: MCF51JF Tower Kit
• Manufacturer: Freescale Semiconductor
• Series: ColdFire®r
• Type: MCUr

Specifications of TWR-MCF51JF-KIT

• Rohs Compliant: YES
• Contents: Board
• Peak Reflow Compatible (260 C): Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: MCF51JF128

2.2 Clocking
The ColdFire+ MCUs start up from an internal digitally controlled oscillator (DCO). Software can enable
the main external oscillator (EXTAL2/XTAL2) if desired. The external oscillator/resonator for the
Multipurpose Clock Generator (MCG) module can range from 32.768 KHz up to a 32 MHz.
The TWR-MCF51JF provides an 8 MHz ceramic resonator as shown in Figure 4 below and sheet 4 of the
schematics.
2.3 System Power
When installed into a Tower System, the TWR-MCF51JF can be powered from either an on-board
source or from another source in the assembled Tower System.
In stand-alone operation, the main power source for the TWR-MCF51JF module is derived from the
5.0V input from either the OSBDM USB mini-B connector (J19), the MCF51JF USB micro-AB connector
(J15), or the EzPort header (J21) when a shunt is placed on jumper J24. Two low-dropout regulators
provide 3.3V and 1.8V supplies from the 5.0V input voltage. Additionally, the 3.3V regulator built into
the MCF51JF can be selected. All the user selectable options can be configured using two headers, J13
and J14.
The J13 header is used to select the power source that is supplied to one of the three possible voltage
regulators. The J14 header is used to select the regulated board power source. Refer to Table 1 and
Table 2 for details.
TWRMCF51JFUM
Real-time debug support, with six hardware breakpoints that can be configured to halt the
processor or generate debug interrupt
External bus interface
Multi-purpose clock generator with PLL and FLL operation modes; multiple input oscillator or
resonator frequency ranges; two internal trimmable references
12-bit SAR ADC (up to 17 single-ended channels), 12-bit DAC
High-speed analog comparator with 6-bit DAC
Programmable voltage reference
SPI, I
GPIO with pin interrupt support, DMA request capability, digital glitch filtering
2
C (w/ SMBUS support), UART (w/ ISO7816 and IrDA),
TWR-MCF51JF Tower Module User's Manual
Figure 4. Main Oscillator Input
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