UPD78F0555MA-FAA-AX Renesas Electronics America, UPD78F0555MA-FAA-AX Datasheet - Page 231

• Manufacturer Part Number: UPD78F0555MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0555MA-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: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 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
5.5 Clock Generator Operation
mode (refer to Figures 5-1 and 5-2).
78K0/Kx2-L microcontrollers, thus enabling the following.
(1) Enhancement of security function
(2) Improvement of performance
R01UH0028EJ0400 Rev.4.00
Sep 27, 2010
The clock generator generates the following clocks and controls the operation modes of the CPU, such as standby
• Main system clock f
• Subsystem clock f
• Internal low-speed oscillation clock f
• CPU clock f
• Peripheral hardware clock f
Note
The CPU starts operation when the internal high-speed oscillator starts outputting after a reset release in the
When the X1 clock is set as the CPU clock by the default setting, the device cannot operate if the X1 clock is
damaged or badly connected and therefore does not operate after reset is released. However, the start clock of the
CPU is the internal high-speed oscillation clock, so the device can be started by the internal high-speed oscillation
clock after a reset release. Consequently, the system can be safely shut down by performing a minimum operation,
such as acknowledging a reset source by software or performing safety processing when there is a malfunction.
Because the CPU can be started without waiting for the X1 clock oscillation stabilization time, the total performance
can be improved.
When the power supply voltage is turned on, the clock generator operation is shown in Figures 5-16 and 5-17.
• High-speed system clock f
• Internal high-speed oscillation clock f
• XT1 clock f
• External subsystem clock f
X1 clock f
External main system clock f
78K0/KC2-L only
CPU
X
XT
SUB
XP
Note
PRS
XH
EXCLKS
EXCLK
IL
IH
CHAPTER 5 CLOCK GENERATOR
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