H83802_10 Datasheet, PDF (133/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 4 Clock Pulse Generators
4.4.1 Connecting 32.768-kHz/38.4-kHz Crystal Resonator
Clock pulses can be supplied to the subclock divider by connecting a 32.768-kHz or 38.4-kHz
crystal resonator, as shown in figure 4.9. Figure 4.10 shows the equivalent circuit of the 32.768-
kHz or 38.4-kHz crystal resonator. Note that only operation at 32.768 kHz is guaranteed on the
H8/38104 Group.
C₁
Frequency
Manufacturer
Product Name
X1
38.4 kHz
Seiko Instruments Inc.
VTC-200
C₂
32.768 kHz NIHON DEMPA KOGYO CO., LTD. MX73P
X2
C₁ = C ₂ = 6 to 12.5 pF (typ.)
Frequency
Manufacturer
Product Name Motion Resistance
32.768 kHz* EPSON TOYOCOM. C-001R
35 kΩ max
C = C = 7 pF (typ.)
1
2
Notes: Consult with the crystal resonator manufacturer
to determine the circuit constants.
* H8/38104 Group only.
Figure 4.9 Typical Connection to 32.768-kHz/38.4-kHz Crystal Resonator
L_S
C_S
R_S
X1
X2
C_O
C_O = 0.8 pF (typ.)
R_S = 14 kΩ (typ.)
f_W = 32.768 kHz/38.4 kHz
Note: Constants are reference values.
Figure 4.10 Equivalent Circuit of 32.768-kHz/38.4-kHz Crystal Resonator
Rev. 7.00 Mar. 08, 2010 Page 101 of 510
REJ09B0024-0700