UPD78F0551MA-FAA-AX Renesas Electronics America, UPD78F0551MA-FAA-AX Datasheet - Page 218

• 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
(2) Processor clock control register (PCC)
R01UH0028EJ0400 Rev.4.00
Sep 27, 2010
This register is used to select the CPU clock, the division ratio, and operation mode for subsystem clock.
PCC is set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets PCC to 01H.
Cautions 1.
Remark
Figure 5-5. Format of Processor Clock Control Register (PCC) (78K0/KY2-L, 78K0/KA2-L, 78K0/KB2-L)
Address: FFFBH
Symbol
PCC
2.
f
Caution
XP
: Main system clock oscillation frequency
Be sure to clear bits 3 to 7 to 0.
The peripheral hardware clock (f
PCC2
7
0
0
0
0
0
1
After reset: 01H
3. The XT1 oscillator is a circuit with low amplification in order to achieve low-power
Other than above
consumption. Note the following points when designing the circuit.
• 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
• Configure the circuit of the circuit board, using material with little wiring
• 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
• The impedance between the XT1 and XT2 pins may drop and oscillation may be
• When coating the circuit board, use material that does not cause capacitance or
PCC1
oscillation evaluation using a circuit board to be actually used and confirm that
there are no problems.
ELECTRICAL SPECIFICATIONS after it is evaluated, when using the XT1
oscillator in the ultra-low power consumption oscillation (RSWOSC = 1).
possible, and minimize the parasitic capacitance and wiring resistance. Note
this particularly when the ultra-low power consumption oscillation (RSWOSC = 1)
is selected.
resistance.
near the XT1 oscillator.
do not cross with the other signal lines. Do not route the wiring near a signal
line through which a high fluctuating current flows.
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.
leakage between the XT1 and XT2 pins.
0
6
0
0
1
1
0
R/W
PCC0
0
1
0
1
0
5
0
PRS
f
f
f
f
f
Setting prohibited
XP
XP
XP
XP
XP
) is not divided when the division ratio of the PCC is set.
/2 (default)
/2
/2
/2
2
3
4
4
0
3
0
CPU clock (f
CHAPTER 5 CLOCK GENERATOR
PCC2
2
CPU
) selection
PCC1
SS
1
as much as possible
Therefore, perform
PCC0
0
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