upd78f9211grt2-jjg-a ETC-unknow, upd78f9211grt2-jjg-a Datasheet - Page 206

• Manufacturer Part Number: upd78f9211grt2-jjg-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: ETC-unknow

• If supply voltage fluctuation is 50 ms or less in vicinity of LVI detection voltage
206
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 14-6. 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 14 LOW-VOLTAGE DETECTOR
Yes
; Check reset source
; The detection level is set with LVIS.
; f
; Clear low-voltage detection flag.
; Clear timaer counter and timer starts.
;
User’s Manual U16994EJ3V0UD
Initialization of ports
Setting WDT
Specify the division ratio of the system clock,
setting Timaer, setting A/D Converter, 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
RL
51 ms when the compare value is 25
(2.1 MHz (MAX.)) /2
Note
12
,
2
(default value)