
45
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
38C8 Group
Table 13 Recommended operating conditions (mask ROM version) (Vcc = 2.2 to 5.5 V, Ta = –20 to 85°C, unless otherwise noted)
Timer X, timer Y input frequency (duty cycle 50%)
Main clock input oscillation frequency (Note 1)
Sub-clock input oscillation frequency (Notes 1, 2)
f(CNTR0)
f(CNTR1)
f(XIN)
f(XCIN)
Limits
Hz
MHz
MHz
MHz
MHz
kHz
Parameter
Min. Typ.
32.768
Max.
f(X
IN)/2
8.0
2.9✕V
CC
–3.6
8.0
8✕(V
CC
–1.7)
50
Symbol Unit
High-speed mode
(4.0 V ≤ VCC ≤ 5.5 V)
High-speed mode
(2.2 V ≤ VCC < 4.0 V)
Middle-speed mode
(2.7 V ≤ VCC ≤ 5.5 V)
Middle-speed mode
(2.2 V ≤ VCC < 2.7 V)
Notes 1: When the oscillation frequency has a duty cycle of 50 %.
2: When using the microcomputer in low-speed mode, set the sub-clock input oscillation frequency on condition that f(X
CIN) < f(XIN)/3.
Table 14 Recommended operating conditions (PROM version) (Vcc = 2.5 to 5.5 V, Ta = –20 to 85°C, unless otherwise noted)
Timer X, timer Y input frequency (duty cycle 50%)
Main clock input oscillation frequency (Note 1)
Sub-clock input oscillation frequency (Notes 1, 2)
f(CNTR0)
f(CNTR1)
f(XIN)
f(XCIN)
Limits
Hz
MHz
MHz
MHz
MHz
kHz
Parameter
Min. Typ.
32.768
Max.
f(XIN)/2
8.0
4✕V
CC
–8
8.0
20✕(V
CC
–2.3)
50
Symbol Unit
High-speed mode
(4.0 V ≤ VCC ≤ 5.5 V)
High-speed mode
(2.5 V ≤ VCC < 4.0 V)
Middle-speed mode
(2.7 V ≤ VCC ≤ 5.5 V)
Middle-speed mode
(2.5 V ≤ VCC < 2.7 V)
Notes 1: When the oscillation frequency has a duty cycle of 50 %.
2: When using the microcomputer in low-speed mode, set the sub-clock input oscillation frequency on condition that f(X
CIN) < f(XIN)/3.
Conditions
Conditions
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