UPD75216ACW

Manufacturer Part NumberUPD75216ACW
Description4-BIT SINGLE-CHIP MICROCOMPUTER
ManufacturerNEC
UPD75216ACW datasheet
 


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SUBSYSTEM CLOCK OSCILLATOR CHARACTERISTICS (Ta = –40 to +85 C, V
RECOMMENDED CIRCUIT
RESONATOR
XT1
XT2
Crystal
R
resonator*1
C3
C4
XT1
XT2
External
Leave Open
clock
* 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
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
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.
PARAMETER
TEST CONDITIONS
Oscillator frequency
(f
) *2
XT
V
= 4.5 to 6.0 V
DD
Oscillation stabilization
time *3
XT1 input frequency
(f
)
XT
XT1 input high and low
level widths (t
, t
)
XTH
XTL
PD75216A
= 2.7 to 6.0 V)
DD
MIN.
TYP.
MAX.
UNIT
35
kHz
32
32.768
2
s
1.0
10
s
kHz
100
32
32
s
10
reaches the
DD
. Do not connect
SS
49