HD404654 Datasheet, PDF (104/111 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404654 Series
5. Applies to ceramic oscillator only.
When using crystal oscillator: V_CC = 2.7 V to 6.0 V, t_RC = 40 ms (typ) or V_CC = 1.8 V to 2.6 V, t_RC =
60 ms (typ)
Crystal oscillator
(OSC₁, OSC₂)
C₁
Crystal
oscillator R_f
OSC₁
C₂
GND
OSC₂
L C_S R_S
OSC₁
C₀
OSC₂
R_f = 1 MΩ ± 20%
C₁ = C₂ = 10–22 pF ± 20%
Crystal: Equivalent to circuit
shown below
C₀ = 7 pF max
R_S = 100 Ω max
f = 400 kHz, 800 kHz,
2 MHz, 3.58 MHz, 4 MHz
• Since the circuit constants change depending on the crystal or ceramic resonator and stray
capacitance of the board, the user should consult with the crystal or ceramic oscillator
manufacturer to determine the circuit parameters.
• Wiring among OSC₁, OSC₂, and elements should be as short as possible, and must not cross
other wiring (see figure 20).
6. Refer to figure 81.
7. Refer to figure 82.
8. Refer to figure 83.
9. Refer to figure 84.
10. Applies to HD4074654.
11. Analog comparator stabilization time is the period for the analog comparator to stabilize and for
correct data to be read after entering RD₀/COMP₀ and RD₁/COMP₁ into analog input mode.
12. HD4074654 : V_CC = 2.7 V to 5.5 V
102