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參數(shù)資料
| 型號(hào)： | UPD75212A |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 4位單片機(jī) |
| 文件頁數(shù)： | 49/70頁 |
| 文件大小： | 516K |
| 代理商： | UPD75212A |
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49
μ
PD75212A
XT1
XT2
C3
C4
R
SUBSYSTEM CLOCK OSCILLATOR CHARACTERISTICS (Ta = –40 to +85
°
C, V
DD
= 2.7 to 6.0 V)
Oscillator frequency
(f
XT
)
*2
Oscillation stabilization
time
*3
XT1 input frequency
(f
XT
)
XT1 input high and low
level widths (t
XTH
, t
XTL
)
V
DD
= 4.5 to 6.0 V
32.768
1.0
35
2
10
100
32
kHz
s
s
kHz
μ
s
Crystal
resonator
*1
External
clock
32
32
10
MIN.
TYP.
MAX.
UNIT
TEST CONDITIONS
PARAMETER
RECOMMENDED CIRCUIT
RESONATOR
*
1.
Recommended resonators are shown in following page.
2.
Oscillator characteristics only. Refer to the description of AC characteristics for instruction execution time.
3.
Oscillation stabilization time is a time required for oscillation to become stabilized after V
DD
reaches the
minimum value in the oscillation voltage range.
Note
When the subsystem clock oscillator is used, the following should be noted concerning wiring in the area
in the figure enclosed by a dotted line to prevent the influence of wiring capacitance, etc.
The wiring should be kept as short as possible.
No other signal lines should be crossed. Keep away from lines carrying a high fluctuating current.
The oscillator capacitor grounding point should always be at the same potential as V
SS
. Do not connect
to a ground pattern carrying a high current.
A signal should not be taken from the oscillator.
The subsystem clock oscillator is a low-amplitude circuit in order to achieve a low consumption current,
and is more prone to misoperation due to noise than the main system clock oscillator. Particular care is
therefore required with the wiring method when the subsystem clock is used.
XT1
Leave Open
XT2
#
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