UPD78F0550MA-FAA-AX Renesas Electronics America, UPD78F0550MA-FAA-AX Datasheet - Page 620

• 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: -

21.4 Cautions for Power-on-Clear Circuit
voltage (V
from release of reset to the start of the operation of the microcontroller can be arbitrarily set by taking the following
action.
620
In a system where the supply voltage (V
<Action>
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.
If supply voltage fluctuation is 50 ms or less in vicinity of POC detection voltage
Note 1
POR,
2.
V
If reset is generated again during this period, initialization processing <2> is not started.
A flowchart is shown on the next page.
PDR
), the system may be repeatedly reset and released from the reset status. In this case, the time
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
CHAPTER 21 POWER-ON-CLEAR CIRCUIT
Initialization
Initialization
Reset
Preliminary User’s Manual U19111EJ2V1UD
Yes
Power-on-clear
DD
) fluctuates for a certain period in the vicinity of the POC detection
;
; 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
= Internal high-speed oscillation clock (default)
Note 2