UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 121

• Manufacturer Part Number: UPD78F9502MA-CAC-A
• Description: 8BIT MCU, 4K FLASH, 128B RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F9502MA-CAC-A

• Controller Family/series: UPD78F
• No. Of I/o's: 8
• Ram Memory Size: 128Byte
• Cpu Speed: 10MHz
• No. Of Timers: 2
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

11.4 Cautions for Power-on-Clear Circuit
voltage (V
release of reset to the start of the operation of the microcontroller can be arbitrarily set by taking the following action.
<Action>
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
In a system where the supply voltage (V
After releasing the reset signal, wait for the supply voltage fluctuation period of each system by means of a
Notes 1.
Note 1
POC
2.
), the system may be repeatedly reset and released from the reset status. In this case, the time from
If reset is generated again during this period, initialization processing <2> is not started.
A flowchart is shown on the next page.
Figure 11-3. Example of Software Processing After Release of Reset (1/2)
No
Setting 8-bit timer H1
(50 ms
50 ms has passed?
processing <1>
(TMIFH1 = 1?)
processing <2>
Clears WDT
Initialization
Initialization
Reset
is measured)
CHAPTER 11 POWER-ON-CLEAR CIRCUIT
Yes
Power-on clear
Preliminary User’s Manual U18681EJ1V0UD
DD
) fluctuates for a certain period in the vicinity of the POC detection
; Check reset source
;
Setting WDT
; f
Initialization of ports
Specify the division ratio of the system clock,
setting Timaer, etc.
Source : f
Timer starts (TMHE1 = 1)
XP
= High-speed internal oscillation clock (8.4 MHz (MAX.)) /2
51 ms when the compare value is 25
RL
(2.1 MHz (MAX.)) /2
Note 2
12
,
2
(default value)
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