upd75212a Renesas Electronics Corporation., upd75212a Datasheet - Page 48

• Manufacturer Part Number: upd75212a
• Description: 4-bit Single-chip Microcomputer
• Manufacturer: Renesas Electronics Corporation.

48
MAIN SYSTEM CLOCK OSCILLATOR CHARACTERISTICS (Ta = –40 to +85 C, V
* 1. Refer to RECOMMENDED OSCILLATOR CONSTANTS.
Note
RESONATOR
Ceramic
resonator*1
Crystal
resonator*1
External
clock
2. Oscillator characteristics only. Refer to the description of AC characteristics for details of instruction execution
3. Time required for oscillation to become stabilized after V
4. When oscillator frequency is “4.19 < f
value of 0.95 s cannot be observed.
time.
voltage range or STOP mode release.
If “PCC = 0011” is selected, 1 machine cycle becomes less than 0.95 s, with the result that the specified MIN.
When the main system 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
• A signal should not be taken from the oscillator.
to a ground pattern carrying a high current.
RECOMMENDED CIRCUIT
C1
C1
X1
X1
X1
PD74HCU04
X2
X2
X2
C2
C2
Oscillator frequency
(f
Oscillation
stabilization time *3
Oscillator frequency
Oscillation stabilization
time *3
X1 input frequency
X1 input high and low
level widths (t
(f
(f
XX
XX
X
) *2
) *2
) *2
XX
PARAMETER
< – 5.0 MHz”, do not select “PCC = 0011” as instruction execution time.
XH
, t
XL
)
V
After V
minimum value in
the oscillation
voltage range
V
TEST CONDITIONS
DD
DD
DD
= Oscillation
= 4.5 to 6.0 V
voltage range
reaches the minimum value in the oscillation
DD
reaches the
DD
= 2.7 to 6.0 V )
MIN.
100
2.0
2.0
2.0
TYP.
4.19
SS
. Do not connect
MAX.
5.0 *4
5.0 *4
5.0 *4
PD75212A
250
10
30
4
UNIT
MHz
MHz
MHz
ms
ms
ms
ns