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HD404356 Datasheet, PDF (92/100 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer
HD404358 Series
Standard fOSC = 5.0 MHz Version AC Characteristics (HD404354/HD404356/HD404358: VCC = 2.7 to
6.0 V, GND = 0 V, Ta = –20 to +75°C)
Item
Symbol Pins
Min Typ Max Unit Test Condition
Note
Clock oscillation
frequency
f OSC
OSC1, OSC2 0.4 4
5.0 MHz 1/4 system clock
division ratio
Instruction cycle time tcyc
0.8 1 10 µs
Oscillation stabilization tRC
OSC1, OSC2 — — 7.5 ms
1
time (ceramic oscillator)
Oscillation stabilization tRC
OSC1, OSC2 — — 40 ms
1
time (crystal oscillator)
External clock high
t CPH
OSC1
80 — — ns
2
width
External clock low width tCPL
OSC1
80 — — ns
2
External clock rise time tCPr
OSC1
— — 20 ns
2
External clock fall time tCPf
OSC1
— — 20 ns
2
INT0, INT1, EVNB high tIH
INT0, INT1,
2
—
—
t cyc
3
widths
EVNB
INT0, INT1, EVNB low tIL
INT0, INT1,
2
—
—
t cyc
3
widths
EVNB
RESET low width
STOPC low width
RESET rise time
STOPC rise time
Input capacitance
t RSTL
RESET
2
—
—
t cyc
4
t STPL
STOPC
1
—
—
t RC
5
t RSTr
RESET
— — 20 ms
4
t STPr
STOPC
— — 20 ms
5
Cin
All input pins — — 15 pF f = 1 MHz, Vin = 0 V
except and R2
R2
— — 30 pF f = 1 MHz, Vin = 0 V
Notes: 1. The oscillation stabilization time is the period required for the oscillator to stabilize in the
following situations:
a. After VCC reaches 2.7 V at power-on.
b. After RESET input goes low when stop mode is cancelled.
c. After STOPC input goes low when stop mode is cancelled.
To ensure the oscillation stabilization time at power-on or when stop mode is cancelled, RESET
or STOPC must be input for at least a duration of tRC.
When using a crystal or ceramic oscillator, consult with the manufacturer to determine what
stabilization time is required, since it will depend on the circuit constants and stray capacitance.
2. Refer to figure 77.
3. Refer to figure 78.
4. Refer to figure 79.
5. Refer to figure 80.
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