UPD78F0550MA-FAA-AX Renesas Electronics America, UPD78F0550MA-FAA-AX Datasheet - Page 177

• 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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(2) Processor clock control register (PCC)
Figure 5-5. Format of Processor Clock Control Register (PCC) (78K0/KY2-L, 78K0/KA2-L, 78K0/KB2-L)
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
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
Other than above
3. The XT1 oscillator is a circuit with low amplification in order to achieve low-
power consumption. Note the following points when designing the circuit.
PCC1
0
0
0
1
1
0
6
Pins and circuit boards include parasitic capacitance. Therefore, perform
oscillation 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
possible near the 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.
R/W
Preliminary User’s Manual U19111EJ2V1UD
CHAPTER 5 CLOCK GENERATOR
PCC0
0
1
0
1
0
5
0
f
f
f
f
f
Setting prohibited
XP
XP
XP
XP
XP
PRS
/2 (default)
/2
/2
/2
) is not divided when the division ratio of the PCC is set.
2
3
4
4
0
3
0
CPU clock (f
PCC2
2
CPU
) selection
PCC1
1
SS
as much as
PCC0
0
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