UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 751

• Manufacturer Part Number: UPD78F0537DGA(T)-9EV-A
• Description: 8BIT MCU, 128K FLASH, 7KB RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F0537DGA(T)-9EV-A

• Controller Family/series: UPD78
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

Electrical
specifications
Recommended
soldering
conditions
Wait
Function
X1 oscillator
characteristics
XT1 oscillator
characteristics
Oscillator
constants
Details of
Function
−
−
When using the X1 oscillator, wire as follows in the area enclosed by the broken
lines in the 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
• Always make the ground point of the oscillator capacitor the same potential as
• Do not ground the capacitor to a ground pattern through which a high current
• Do not fetch signals from the oscillator.
Since the CPU is started by the internal high-speed oscillation clock after a reset
release, check the X1 clock oscillation stabilization time using the oscillation
stabilization time counter status register (OSTC) by the user. 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.
When using the XT1 oscillator, wire as follows in the area enclosed by the broken
lines in the above figure 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
• Always make the ground point of the oscillator capacitor the same potential as
• Do not ground the capacitor to a ground pattern through which a high current
• Do not fetch signals from the oscillator.
The XT1 oscillator is designed as a low-amplitude circuit for reducing power
consumption, and is more prone to malfunction due to noise than the X1
oscillator. Particular care is therefore required with the wiring method when the
XT1 clock is used.
The oscillator constants shown above are reference values based on evaluation
in a specific environment by the resonator manufacturer. If it is necessary to
optimize the oscillator characteristics in the actual application, apply to the
resonator manufacturer for evaluation on the implementation circuit. The
oscillation voltage and oscillation frequency only indicate the oscillator
characteristic. Use the 78K0/KE2 so that the internal operation conditions are
within the specifications of the DC and AC characteristics.
Do not use different soldering methods together (except for partial heating).
When the CPU is operating on the subsystem clock and the peripheral hardware
clock is stopped, do not access the registers listed above using an access
method in which a wait request is issued.
current flows.
V
flows.
current flows.
V
flows.
SS
SS
.
.
APPENDIX D LIST OF CAUTIONS
User’s Manual U17260EJ6V0UD
Cautions
pp. 615,
636, 656,
676
pp. 615,
636, 656,
676
pp. 616,
637, 657,
677
pp. 616,
637, 657,
677
pp. 617,
618
p. 703
p. 705
Page
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