Clock Pulse Generator; Fig. 3.1 Clock Pulse Generator - Fujitsu MB89140 Series Hardware Manual

The operation of MB89140 is described below.

3.1 CLOCK PULSE GENERATOR

The MB89140 series of microcontrollers incorporate the system clock pulse generator. The crystal oscillator
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.
The X0A and X1A pins are used for the subclock and function in the same manner as the X0 and X1 pins.
When the single-channel clock option is selected, the X0A and X1A pins serve as the P70 and P71 pins re-
spectively.
Xtal
C C
Xtal
C C
OPERATION
MB8914X
X0
X1
X0A
R
F
X1A
R
D

Fig. 3.1 Clock Pulse Generator

3-3
MB8914X
X0
OPEN X1
OSC.
X0A
OPEN X1A
OSC.