HD404344R Datasheet, PDF (41/102 Pages) Renesas Technology Corp – 4-bit microcomputer has an A/D converter

HD404344R Series/HD404394 Series
Oscillator Circuit
Figure 17 shows a block diagram of the clock generation circuit. Ceramic oscillator can be connected to
OSC₁ and OSC₂ as listed in table 16. An external clock can also be connected. In addition, the system
oscillator of the HD404344R Series is capable of CR oscillation.
OSC₂
OSC₁
System ^{fOSC 1/4}
f_cyc
oscillator
division
circuit ^tcyc
Timing
generator
circuit
System
clock
generation
ø_CPU
ø_PER
Figure 17 Clock Generation Circuit
CPU with ROM,
RAM, registers,
flags, and I/O
Peripheral
function
interrupt
: GND
R2₃
OSC₁
OSC₂
GND
Figure 18 Typical Layout of Ceramic Oscillator
39