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| HD404639R Datasheet, PDF (43/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer | |||
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HD404639R Series
Circuit
Configuration
Crystal oscillator
(OSC1, OSC2)
C1
Crystal
oscillator Rf
OSC1
C2
GND
OSC2
L CS RS
OSC1
C0
OSC2
Circuit Constants
Rf = 1 M⦠± 20%
C1 = C2 = 10â22 pF ± 20%
Crystal: Equivalent to circuit shown below
C0 = 7 pF max
RS = 100 ⦠max
f = 400 kHz, 800 kHz, 2 MHz, 3.58 MHz, 4
MHz, 7.16 MHz, 8 MHz
Crystal oscillator
(X1, X2)
C1
Crystal
oscillator
C2
GND
L
X1
X2
CS RS
X1
X2
Crystal: 32.768 kHz: MX38T (Nippon
Denpa)
C1 = C2 = 20 pF ± 20%
RS: 14 kâ¦
C0: 1.5 pF
C0
Notes: 1. Since the circuit constants change depending on the crystal or ceramic oscillator and stray
capacitance of the board, the user should consult with the crystal or ceramic oscillator
manufacturer to determine the circuit parameters.
2. Wiring among OSC1, OSC2, X1, X2, and elements should be as short as possible, and must not
cross other wiring (see figure 25).
3. If the 32.768-kHz crystal oscillator is not used, the X1 pin must be fixed to VCC and X2 must be
open.
41
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