Fujitsu MB90390 Series Hardware Manual page 623

■ Oscillating Clock Frequency and Serial Clock Input Frequency
The equation listed below can be used to calculate the serial clock frequencies that can be used for the
MB90F394H(A). Set an appropriate serial clock input frequency in the flash microcontroller programmer
according to the oscillating clock frequency in use.
= 0.125 × f
f
SC
where fsc is the serial clock frequency and fosc is the oscillating clock frequency.
Table 29.1-3 Examples of Serial Clock Frequencies That can be Used
Oscillating clock
frequency
4 MHz
*
8 MHz
*
16 MHz
*: External clock only.
CHAPTER 29 EXAMPLES OF SERIAL PROGRAMMING CONNECTION
OSC
Maximum serial clock
frequency that can be
used for microcontroller
500 kHz
1 MHz
2 MHz
Maximum serial clock
frequency that can be
used for the AF220,
AF210, AF120, and
AF110
500 kHz
850 kHz
1.25 MHz
Maximum serial clock
frequency that can be
used for the AF200
500 kHz
500 kHz
500 kHz
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