HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 154

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

(2) Crystal Oscillator: The external crystal should have the characteristics listed in table 8-1.
Table 8-1 (1) External Crystal Parameters
Frequency (MHz)
Rs max (Ω)
C
Table 8-1 (2) External Crystal Parameters
Frequency (MHz)
Rs max (Ω)
C
Note: Use a fundamental-mode crystal (not an overtone crystal).
(3) Note on Board Design: When an external crystal is connected, other signal lines should be
0
0
(pF)
(pF)
kept away from the crystal circuit to prevent induction from interfering with correct
oscillation. See figure 8-4.
When the board is designed, the crystal and its load capacitors should be placed as close as
possible to the XTAL and EXTAL pins.
XTAL
(HD6475368R, HD6475348R, HD6435368R, HD6435348R)
(HD6475368S, HD6475348S, HD6435368S, HD6435348S)
Figure 8-2 Connection of Crystal Oscillator (Example)
500
7pF max
120
7pF max
2
4
Figure 8-3 Crystal Oscillator Equivalent Circuit
EXTAL
XTAL
L
4
120
8
80
8
60
12
60
C
L
Fig. 8-3
136
C
C
C
12
40
16
50
L1
L2
0
AT-cut parallel resonating crystal
C
40
16
30
20
L1
=C
R
L2
S
20
20
24
40
=10 to 22pF
EXTAL