UPD78F0550MA-FAA-AX Renesas Electronics America, UPD78F0550MA-FAA-AX Datasheet - Page 189

• 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: -

5.4.3 When subsystem clock is not used
or if not using the subsystem clock as an Input port, set the XT1 and XT2 pins to Input mode (OSCSELS = 0) and
independently connect to V
5.4.4 Internal high-speed oscillator
by the internal oscillation mode register (RCM).
5.4.5 Internal low-speed oscillator
internal low-speed oscillation clock cannot be used as the CPU clock.
by software” is set, oscillation can be controlled by the internal oscillation mode register (RCM).
driven (30 kHz (TYP.)) if the watchdog timer operation is enabled using the option byte.
5.4.6 Prescaler
as the clock to be supplied to the CPU.
Remark When using the subsystem clock, replace X1 and X2 with XT1 and XT2, respectively. Also, insert
Caution
If it is not necessary to use the subsystem clock
Note
The internal high-speed oscillator is incorporated in the 78K0/Kx2-L microcontrollers. Oscillation can be controlled
After a reset release, the internal high-speed oscillator automatically starts oscillation.
Internal high-speed oscillation clock frequency (4 MHz (TYP.)/8 MHz (TYP.)) can be set by the option byte.
The internal low-speed oscillator is incorporated in the 78K0/Kx2-L microcontrollers.
The internal low-speed oscillation clock is only used as the watchdog timer and the clock of 8-bit timer H1. The
“Can be stopped by software” or “Cannot be stopped” can be selected by the option byte. When “Can be stopped
After a reset release, the internal low-speed oscillator automatically starts oscillation, and the watchdog timer is
The prescaler generates the CPU clock by dividing the main system clock when the main system clock is selected
78K0/KC2-L only
resistors in series on the XT2 side.
2. When X2 and XT1 are wired in parallel, the crosstalk noise of X2 may increase with XT1,
resulting in malfunctioning.
(e) Signals are fetched
V
SS
Figure 5-15. Examples of Incorrect Resonator Connection (2/2)
DD
X1
or V
SS
via a resistor.
X2
Preliminary User’s Manual U19111EJ2V1UD
CHAPTER 5 CLOCK GENERATOR
Note
for low power consumption operations, watch operations, etc.,
189