UPD78F0555MA-FAA-AX Renesas Electronics America, UPD78F0555MA-FAA-AX Datasheet - Page 683

• 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
21.4 Cautions for Power-on-Clear Circuit
(V
reset to the start of the operation of the microcontroller can be arbitrarily set by taking the following action.
R01UH0028EJ0400 Rev.4.00
Sep 27, 2010
POR,
In a system where the supply voltage (V
<Action>
• If supply voltage fluctuation is 50 ms or less in vicinity of POC detection voltage
Notes 1.
After releasing the reset signal, wait for the supply voltage fluctuation period of each system by means of a software
counter that uses a timer, and then initialize the ports.
V
PDR
Note 1
2.
), the system may be repeatedly reset and released from the reset status. In this case, the time from release of
If reset is generated again during this period, initialization processing <2> is not started.
A flowchart is shown on the next page.
Figure 21-3. Example of Software Processing After Reset Release (1/2)
No
Setting 8-bit timer H1
(to measure 50 ms)
50 ms has passed?
processing <1>
processing <2>
(TMIFH1 = 1?)
Clearing WDT
Initialization
Initialization
Reset
DD
Yes
Power-on-clear
) fluctuates for a certain period in the vicinity of the POC detection voltage
;
; f
; Initial setting for ports,
Check the reset source
Set the count clock and compare value so that
INTTMH1 occurs after 50 ms have elapsed.
Timer starts (TMHE1 = 1).
setting of division ratio of system clock,
such as setting of timer or A/D converter.
PRS
CHAPTER 21 POWER-ON-CLEAR CIRCUIT
= Internal high-speed oscillation clock (default)
Note 2
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