upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 445

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

• If supply voltage fluctuation is 50 ms or less in vicinity of LVI detection voltage
Note A flowchart is shown on the next page.
No
Figure 17-7. Example of Software Processing After Reset Release (1/2)
(TMHE1 = 0 → TMHE1 = 1)
Setting 8-bit timer H1
(to measure 50 ms)
50 ms has passed?
Restarting timer H1
voltage or higher
processing <1>
processing <2>
(TMIFH1 = 1?)
Clearing WDT
Initialization
Initialization
(LVIF = 0?)
Setting LVI
Detection
LVIF = 0
Reset
No
Yes
LVI reset
CHAPTER 17 LOW-VOLTAGE DETECTOR
Preliminary User’s Manual U19014EJ1V0UD
Yes
;
; Setting of detection level by LVIS
; f
; Setting of division ratio of system clock,
;
; The timer counter is cleared and the timer is started.
Check the reset source
Initialize the port.
The low-voltage detector operates (LVION = 1).
Source: f
Timer starts (TMHE1 = 1).
such as setting of timer
The low-voltage detection flag is cleared.
RL
= Internal low-speed oscillation clock (264 kHz (MAX.))
Where comparison value = 104: ≅ 50 ms
RL
(264 kHz (MAX.))/2
Note
7
,
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