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HD404849 Datasheet, PDF (121/127 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer | |||
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HD404849 Series
AC Characteristics (HD404848/HD4048412/HD404849: VCC = 2.7 to 6.0 V, GND = 0 V, Ta = â20°C to
+75°C; HD4074849: VCC = 2.7 to 5.5 V, GND = 0 V, Ta = â20°C to +75°C, unless otherwise specified)
Item
Symbol Pin(s)
Min Typ Max Unit Test Condition Note
Clock oscillation
f OSC
OSC1, OSC2 0.4 â
4.5 MHz 1/4 division
1
frequency
X1, X2
â 32.768 â kHz â
Instruction cycle time tcyc
â
t subcyc
â
0.89 â
10 µs
â 244.14 â µs 32-kHz oscillator, 2
1/8 division
â 122.07 â µs 32-kHz oscillator, 2
1/4 division
Oscillation stabilization tRC
OSC1, OSC2 â â
7.5 ms
3
time
(ceramic oscillator)
Oscillation stabilization tRC
OSC1, OSC2 â â
30 ms â
3
time
(crystal oscillator)
External clock high
t CPH
width
X1, X2
OSC1
ââ
105 â
2
s
Ta = â10°C to+60°C 3
â ns fOSC = 4 MHz
4
External clock low width tCPL
OSC1
105 â
â ns fOSC = 4 MHz
4
External clock rise time tCPr
OSC1
ââ
20 ns fOSC = 4 MHz
4
External clock fall time tCPf
OSC1
ââ
20 ns fOSC = 4 MHz
4
INT0âINT3, EVNB,
t IH
INT0âINT3,
2â
â
tcyc/ â
5
EVND high widths
EVNB, EVND
t subcyc
INT0âINT3, EVNB,
t IL
INT0âINT3,
2â
â
tcyc/ â
5
EVND low widths
EVNB, EVND
t subcyc
RESET low width
t RSTL
RESET
2â
â
t cyc
â
6
STOPC low width
t STPL
STOPC
1â
â
t RC
â
7
RESET rise time
t RSTr
RESET
ââ
20 ms â
6
STOPC rise time
t STPr
STOPC
ââ
20 ms â
7
Input capacitance
Cin
All pins except â â
D11
15 pF f = 1 MHz, Vin = 0 V
D11
ââ
180 pF f = 1 MHz, Vin = 0 V 8
Notes: 1. When the subsystem oscillator (32.768-kHz crystal oscillator) is used, fOSC must operate under
one of the following conditions: 0.4 MHz ⤠fOSC ⤠1.0 MHz or 1.6 MHz ⤠fOSC ⤠4.5 MHz. Set bit 1
of the system clock select register (SSR: $029) to 0 for the former, and 1 for the latter.
2. For the HD404848, HD4048412, and HD404849, instructions can be executed during subactive
mode if VCC = 2.2 V to 6.0 V.
3. The oscillation stabilization time is defined as the time required for the oscillator to stabilize in the
following three cases:
⢠After VCC reaches 2.7 V at power-on
⢠After RESET input goes low when stop mode is cancelled
119
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