Subclock Generator; Figure 4.6 Typical Connection To 32.768 Khz/38.4 Khz Crystal Oscillator (Subclock); Figure 4.7 Equivalent Circuit Of 32.768 Khz/38.4 Khz Crystal Oscillator - Renesas H8/3847R Series Hardware Manual

Section 4 Clock Pulse Generators
The circuit parameters are affected by the crystal or ceramic oscillator and floating
capacitance when designing the board. When using the oscillator, consult with the crystal
or ceramic oscillator manufacturer to determine the circuit parameters.
4.3

Subclock Generator

1. Connecting a 32.768 kHz/38.4 kHz Crystal Oscillator
Clock pulses can be supplied to the subclock divider by connecting a 32.768 kHz/38.4 kHz crystal
oscillator, as shown in figure 4.6. Follow the same precautions as noted under 3. notes on board
design for the system clock in section 4.2.
Note: Circuit constants should be determined in consultation
Oscillation frequency Manufacturer
38.4 kHz
32.768 kHz

Figure 4.6 Typical Connection to 32.768 kHz/38.4 kHz Crystal Oscillator (Subclock)

Figure 4.7 shows the equivalent circuit of the 32.768 kHz/38.4 kHz crystal oscillator.
X
1

Figure 4.7 Equivalent Circuit of 32.768 kHz/38.4 kHz Crystal Oscillator

Rev. 6.00 Aug 04, 2006 page 122 of 680
REJ09B0145-0600
C
1
X
1
X
2
C
2
with the resonator manufacturer.
Seiko Instrument Inc.
Nihon Denpa Kogyo
C
S
L
S
C = C = 15 pF (typ.)
1 2
Products Name
VTC-200
MX73P
R
S
C
C = 1.5 pF typ
0 0
Ω
R = 14 k typ
S
f = 32.768 kHz/38.4kHz
W
X
2