M38C89MB datasheet(46/55 Pages) RENESAS

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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

MHz

kHz

Parameter

Min.

Typ.

32.768

Max.

f(XIN)/2

8.0

2.9✕VCC–3.6

8.0

8✕(VCC–1.7)

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(XCIN) < 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

MHz

kHz

Parameter

Min.

Typ.

32.768

Max.

f(XIN)/2

8.0

4✕VCC–8

8.0

20✕(VCC–2.3)

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(XCIN) < f(XIN)/3.

Conditions

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