UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 673

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

28.2 Oscillator Characteristics
(1) Main System Clock (Crystal/Ceramic) Oscillator Characteristics
Note Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
Cautions 1. When using the X1 oscillator, wire as follows in the area enclosed by the broken lines in the
Remark For the resonator selection and oscillator constant, customers are requested to either evaluate the
Ceramic
resonator
Crystal
resonator
Resonator Recommended Circuit
(T
A
= −40 to +125°C, 2.7 V ≤ V
2. Since the CPU is started by the 8 MHz internal oscillator after reset, check the oscillation
oscillation themselves or apply to the resonator manufacturer for evaluation.
above figures to avoid an adverse effect from wiring capacitance.
• Keep the wiring length as short as possible.
• Do not cross the wiring with the other signal lines.
• Do not route the wiring near a signal line through which a high fluctuating current flows.
• Always make the ground point of the oscillator capacitor the same potential as V
• Do not ground the capacitor to a ground pattern through which a high current flows.
• Do not fetch signals from the oscillator.
stabilization time of the main system clock using the oscillation stabilization time counter status
register (OSTC). Determine the oscillation stabilization time of the OSTC register and oscillation
stabilization time select register (OSTS) after sufficiently evaluating the oscillation stabilization
time with the resonator to be used.
V
V
SS
SS
C1
C1
X1
X1
C2
C2
X2
X2
CHAPTER 28 ELECTRICAL SPECIFICATIONS ((A2) products))
X1 clock
oscillation
frequency (f
X1 clock
oscillation
frequency (f
DD
Parameter
= EV
DD
X
X
)
)
User’s Manual U17554EJ4V0UD
≤ 5.5 V, V
Note
Note
4.0 V ≤ V
2.7 V ≤ V
4.0 V ≤ V
2.7 V ≤ V
SS
= EV
DD
DD
DD
DD
≤ 5.5 V
< 4.0 V
≤ 5.5 V
< 4.0 V
SS
Conditions
= AV
SS
= 0 V)
MIN.
4.0
4.0
4.0
4.0
TYP.
SS
MAX.
.
20
10
20
10
MHz
MHz
Unit
673