uPD780065 Subseries PUM - Renesas Electronics

94
CHAPTER 5 CLOCK GENERATOR
5.4.2 Subsystem clock oscillator
The subsystem clock oscillator oscillates with a crystal resonator (standard: 32.768 kHz) connected to the XT1
and XT2 pins.
External clocks can be input to the main system clock oscillator. In this case, input a clock signal to the XT1 pin
and an inverted-phase clock signal to the XT2 pin.
Figure 5-5 shows an external circuit of the subsystem clock oscillator.
VSS1
Figure 5-5. External Circuit of Subsystem Clock Oscillator
(a) Crystal oscillation (b) External clock
32.768
kHz
Cautions are listed on the next page.
XT1
XT2
IC
External
clock
Preliminary User’s Manual U13420EJ2V0UM00
μPD74HCU04
XT1
XT2