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CHAPTER 3 OPERATION
3.1 Clock Pulse Generator
This section describes the clock pulse generator.
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Clock Pulse Generator
The MB89990 series of microcontrollers incorporate the system clock pulse generator. The
ceramic or crystal oscillator, or CR is connected to the X0 and X1 pins to generate clock pulses.
Clock pulses can also be supplied internally by inputting externally-generated clock pulses to
the X0 pin. The X1 pin should be kept open.
Figure 3.1-1 Clock Pulse Generator
Xtal
C C
MB89990
X0
X1
MB89990
X0
X1
OPEN
R
C
X0
X1
MB89990