HD6433832S Datasheet, PDF (105/560 Pages) Renesas Technology Corp – single-chip microcomputers

(2) External clock
Input a square waveform to the X₁ pin. When using the CPU, timer A, timer C, timer G, or an
LCD, with a subclock (øw) clock selected, do not stop the clock supply to the X₁ pin.
t_xH
V_IH
V_IL
t_xL
t_xr
t_xf
Figure 4.10 External Subclock Timing
The DC characteristics and timing of an external clock input to the X₁ pin are shown in table 4.2.
Table 4.2 DC Characteristics and Timing
(V_CC = 2.7 V to 5.5 V, AV_CC = 2.7 V to 5.5 V, V_SS = AV_SS = 0.0 V, T_a = –20°C to + 75°C, unless
otherwise specified, including subactive mode)
Item
Applicable Test
Symbol Pin
Conditions Min
Values
Typ
Max
Unit Notes
Input high voltage V_IH
X₁
Input low voltage
V_IL
External subclock t_xr
rise time
V_CC –0.3 —
–0.3
—
—
—
V_CC +0.3 V
0.3
100
ns
Figure 4.10
Figure 4.10
External subclock t_xf
fall time
—
—
100
External subclock f_x
oscillation frequency
—
32.768 —
kHz
External subclock t_xH
high width
12.0
—
—
µs Figure 4.10
External subclock t_xL
low width
12.0
—
—
µs
90