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CHAPTER 23 EXAMPLE of CONNECTING SERIAL WRITING
23.2 Oscillation Clock Frequency and Serial Clock Input Frequency
23.2
Oscillation Clock Frequency and Serial Clock Input
Frequency
The MB90F337 serial clock frequency that can be input is determined by the following
expression:
Thus, set up the flash microcontroller programmer to change the serial clock input
frequency corresponding to the using oscillation clock frequency.
■ Oscillation Clock Frequency and Serial Clock Input Frequency
Serial clock frequencies that can be input are determined using the expression below.
Inputable serial clock frequency = 0.125 x oscillation clock frequency.
Table 23.2-1 shows the serial clock frequencies that can be input.
Table 23.2-1 Serial Clock Frequency that can be Input
Maximum serial clock
Oscillation clock
frequency that can be input
frequency
to the microcomputer
in 6 MHz
516
Maximum serial clock frequency
that can be set with AF220,
AF210, AF120, or AF110
750 kHz
FUJITSU MICROELECTRONICS LIMITED
MB90335 Series
Maximum serial clock
frequency that can be
set with AF200
500 kHz
500 kHz
CM44-10137-6E
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