C8051F388-B Datasheet, PDF (20/285 Pages) Silicon Laboratories – Flash MCU Family

C8051F388/9/A/B
2.1. Hardware Incompatibilities
While the C8051F388/9/A/B family includes a number of new features not found on the C8051F34x family,
there are some differences that should be considered for any design port.
 Clock Multiplier: The C8051F388/9/A/B does not include the 4x clock multiplier from the C8051F34x
device families. This change only impacts systems which use the clock multiplier in conjunction with an
external oscillator source.
 USB: The C8051F388/9/A/B devices do not include the USB module.
 External Oscillator C and RC Modes: The C and RC modes of the oscillator have a divide-by-2 stage
on the C8051F388/9/A/B to aid in noise immunity. This was not present on the C8051F34x device
family, and any clock generated with C or RC mode will change accordingly.
 Fab Technology: The C8051F388/9/A/B is manufactured using a different technology process than the
C8051F34x. As a result, many of the electrical performance parameters will have subtle differences.
These differences should not affect most systems but it is nonetheless important to review the electrical
parameters for any blocks that are used in the design, and ensure they are compatible with the existing
hardware.
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