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Table 2-2. RS-232 Serial Connector Description
2.5 Clock Source
The 56F8346EVM uses an 8.00MHz crystal, Y1, connected to its External Crystal Inputs,
EXTAL and XTAL. To achieve its 120MHz maximum internal operating frequency, the
56F8346 uses its internal PLL to multiply the input frequency by 15. An external
oscillator source can be connected to the hybrid controller by using the oscillator bypass
connectors, JG1 and JG2; see
EXTAL input should be jumpered to ground by adding a jumper between JG1 pins 2 and
3. The input frequency would then be injected on JG2's pin 2. If the input frequency is
below 4MHz, then the input frequency can be injected on JG1's pin 2.
Figure 2-5. Schematic Diagram of the Clock Interface
2.6 Operating Mode
The 56F8346EVM provides three BOOT MODE selection jumpers, EXTBOOT,
EMI_MODE and CLKMODE, to provide boot-up MODE options.
2-8
Freescale Semiconductor, Inc.
P2
Pin #
Signal
1
Jumper to 6 & 4
2
TXD
3
RXD
4
Jumper to 1 & 6
5
GND
Figure
2-5. If the input frequency is above 8MHz, then the
EXTERNAL
OSCILLATOR
HEADERS
JG1
1
2
3
8.00MHz
JG2
1
2
56F8346EVM User Manual
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Go to: www.freescale.com
Pin #
Signal
6
Jumper to 1 & 4
7
Jumper to 8
8
Jumper to 7
9
N/C
56F8346
EXTAL
XTAL
MOTOROLA
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