UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 131

• 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

If supply voltage fluctuation is 50 ms or less in vicinity of LVI detection voltage
Note
No
A flowchart is shown on the next page.
Detection voltage or more
(TMHE1 = 0 TMHE1 = 1)
Restarting the timaer H1
Setting 8-bit timer H1
(50 ms
50 ms has passed?
Figure 12-6. Example of Software Processing After Release of Reset (1/2)
processing <2>
processing <1>
(TMIFH1 = 1?)
Clears WDT
Initialization
Initialization
(LVIF = 0 ?)
Setting LVI
LVIF = 0
Reset
is measured)
No
Yes
LVI reset
CHAPTER 12 LOW-VOLTAGE DETECTOR
Yes
Preliminary User’s Manual U18681EJ1V0UD
; Check reset source
; The detection level is set with LVIS.
; f
; Clear low-voltage detection flag.
; Clear timaer counter and timer starts.
;
Setting WDT
Initialization of ports
Specify the division ratio of the system clock,
setting Timaer, etc.
Source : f
Timer starts (TMHE1 = 1)
The low-voltage detector is operated (LVION = 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
12
,
2
(default value)
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