C8051F390 データシートの表示（PDF） - Silicon Laboratories
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C8051F390 Datasheet PDF : 300 Pages
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C8051F39x/37x
3. C8051F33x Compatibility
The C8051F39x/37x family is designed to be a pin and code compatible replacement for the C8051F33x
device family, with an enhanced feature set. The C8051F39x/37x device should function as a drop-in
replacement for the C8051F33x devices in most applications. Table 3.1 lists recommended replacement
part numbers for C8051F33x devices. See “3.1. Hardware Incompatibilities” to determine if any changes
are necessary when upgrading an existing C8051F33x design to the C8051F39x/37x.
Table 3.1. C8051F33x Replacement Part Numbers
C8051F33x Part Number
C8051F39x/37x Part Number
C8051F330-GM
C8051F396-A-GM
C8051F331-GM
C8051F397-A-GM
C8051F332-GM
C8051F333-GM
C8051F398-A-GM
C8051F399-A-GM
C8051F334-GM
C8051F398-A-GM
C8051F335-GM
C8051F399-A-GM
C8051F336-GM
C8051F392-A-GM
C8051F337-GM
C8051F393-A-GM
C8051F338-GM
C8051F390-A-GM
C8051F339-GM
C8051F391-A-GM
3.1. Hardware Incompatibilities
While the C8051F39x/37x family includes a number of new features not found on the C8051F33x family,
there are some differences that should be considered for any design port.
Internal High-Frequency Oscillator: The undivided high-frequency oscillator on the C8051F39x/37x
is 49 MHz, whereas the undivided high-frequency oscillator on the C8051F33x is 24.5 MHz.
Correspondingly, the internal high frequency divide ratios (IFCN) have doubled. Thus, firmware written
for the C8051F33x where the CLKSL[1:0] = 00b will result in the same SYSCLK frequency on the
C8051F39x/37x.
Fabrication Technology: The C8051F39x/37x is manufactured using a different technology process
than the C8051F33x. 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.
5 V Tolerance: The port I/O pins on the C8501F39x/37x are not 5 V tolerant, whereas the port I/O pins
on the C8051F33x are 5 V tolerant.
Lock Byte Address: The lock byte for C8051F39x/7x devices with 16 kB of Flash resides at address
0x3FFF, whereas the lock byte for C8051F33x devices with 16 kB of Flash resides at address 0x3DFF.
The lock byte for C8051F39x/7x devices with 8 kB of Flash resides at address 0x1FFF, whereas the
lock byte for C8051F33x devices with 8 kB of Flash resides at address 0x1DFF.
Preliminary Rev. 0.71
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