UPD78F0550MA-FAA-AX Renesas Electronics America, UPD78F0550MA-FAA-AX Datasheet - Page 187

• Manufacturer Part Number: UPD78F0550MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0550MA-FAA-AX

• Package / Case: *
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Speed: 10MHz
• Number Of I /o: 12
• Core Processor: 78K/0
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Program Memory Size: 4KB (4K x 8)
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Peripherals: LVD, POR, PWM, WDT
• Connectivity: I²C, LIN, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

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Caution
Figure 5-15 shows examples of incorrect resonator connection.
1. When using the X1 oscillator and XT1 oscillator, wire as follows in the area enclosed by the
The XT1 oscillator is a circuit with low amplification in order to achieve low-power
consumption. Note the following points when designing the circuit.
• Do not fetch signals from the oscillator.
broken lines in the Figures 5-13 and 5-14 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
• Always make the ground point of the oscillator capacitor the same potential as V
Pins and circuit boards include parasitic capacitance.
evaluation using a circuit board to be actually used and confirm that there are no
problems.
Use the recommended resonator, which will be described in CHAPTER 28 ELECTRICAL
SPECIFICATIONS (TARGET VALUES) after it is evaluated, when using the XT1 oscillator in
the ultra-low power consumption oscillation (RSWOSC = 1).
Make the wiring between the XT1 and XT2 pins and the resonators as short as possible,
and minimize the parasitic capacitance and wiring resistance. Note this particularly when
the ultra-low power consumption oscillation (RSWOSC = 1) is selected.
Configure the circuit of the circuit board, using material with little wiring resistance.
Place a ground pattern that has the same potential as V
XT1 oscillator.
Be sure that the signal lines between the XT1 and XT2 pins, and the resonators do not
cross with the other signal lines. Do not route the wiring near a signal line through which
a high fluctuating current flows.
The impedance between the XT1 and XT2 pins may drop and oscillation may be disturbed
due to moisture absorption of the circuit board in a high-humidity environment or dew
condensation on the board. When using the circuit board in such an environment, take
measures to damp-proof the circuit board, such as by coating.
When coating the circuit board, use material that does not cause capacitance or leakage
between the XT1 and XT2 pins.
line through which a high fluctuating current flows.
not ground the capacitor to a ground pattern through which a high current flows.
Preliminary User’s Manual U19111EJ2V1UD
CHAPTER 5 CLOCK GENERATOR
SS
Therefore, perform oscillation
as much as possible near the
SS
. Do
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