UPD78F0551MA-FAA-AX Renesas Electronics America, UPD78F0551MA-FAA-AX Datasheet - Page 228

• Manufacturer Part Number: UPD78F0551MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0551MA-FAA-AX

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: I²C, LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 9
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

78K0/Kx2-L
R01UH0028EJ0400 Rev.4.00
Sep 27, 2010
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.
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 line
• Always make the ground point of the oscillator capacitor the same potential as V
• Do not fetch signals from the oscillator.
• Pins and circuit boards include parasitic capacitance.
• Use the recommended resonator, which will be described in CHAPTER 28
• Make the wiring between the XT1 and XT2 pins and the resonators as short as possible, and
• Configure the circuit of the circuit board, using material with little wiring resistance.
• Place a ground pattern that has the same potential as V
• Be sure that the signal lines between the XT1 and XT2 pins, and the resonators do not cross
• The impedance between the XT1 and XT2 pins may drop and oscillation may be disturbed due
• When coating the circuit board, use material that does not cause capacitance or leakage
evaluation using a circuit board to be actually used and confirm that there are no problems.
SPECIFICATIONS after it is evaluated, when using the XT1 oscillator in the ultra-low power
consumption oscillation (RSWOSC = 1).
minimize the parasitic capacitance and wiring resistance. Note this particularly when the ultra-
low power consumption oscillation (RSWOSC = 1) is selected.
oscillator.
with the other signal lines. Do not route the wiring near a signal line through which a high
fluctuating current flows.
to moisture absorption of the circuit board in a high-humidity environment or dew
condensation on the board.
measures to damp-proof the circuit board, such as by coating.
between the XT1 and XT2 pins.
through which a high fluctuating current flows.
ground the capacitor to a ground pattern through which a high current flows.
When using the circuit board in such an environment, take
CHAPTER 5 CLOCK GENERATOR
SS
as much as possible near the XT1
Therefore, perform oscillation
ELECTRICAL
SS
. Do not
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