UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 674

• 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

(2) On-chip Internal Oscillator Characteristics
Note Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
Remark RSTS: Bit 7 of the internal oscillator mode register (RCM)
(3) Subsystem Clock Oscillator Characteristics
Note Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
Cautions 1. When using the XT1 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
674
8 MHz internal oscillator
240 kHz internal oscillator
Crystal
resonator
Resonator
(T
(T
A
A
Resonator
= −40 to +125°C, 2.7 V ≤ V
= −40 to +125°C, 2.7 V ≤ V
2. The subsystem clock oscillator is designed as a low-amplitude circuit for reducing power
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.
consumption, and is more prone to malfunction due to noise than the high-speed system clock
oscillator. Particular care is therefore required with the wiring method when the subsystem
clock is used.
Recommended Circuit
V
SS
C4
Rd
XT2
Internal high-speed oscillation
clock frequency (f
Internal low-speed oscillation
clock frequency (f
CHAPTER 28 ELECTRICAL SPECIFICATIONS ((A2) products))
C3
XT1
Parameter
DD
DD
= EV
= EV
XT1 clock oscillation
frequency (f
RH
RL
DD
DD
)
)
Note
User’s Manual U17554EJ4V0UD
≤ 5.5 V, V
≤ 5.5 V, V
Parameter
XT
)
Note
RSTS = 1
RSTS = 0
2.7 V ≤ V
SS
SS
= EV
= EV
DD
SS
SS
≤ 5.5 V
Conditions
= AV
= AV
2.7 V ≤ V
Conditions
SS
SS
= 0 V)
= 0 V)
DD
≤ 5.5 V
MIN.
MIN.
2.48
216
7.6
32
32.768
TYP.
TYP.
240
5.6
8
SS
MAX.
MAX.
8.46
9.86
264
35
.
MHz
Unit
Unit
kHz
kHz
MHz