upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 380

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

• If supply voltage fluctuation is 50 ms or less in vicinity of LVI detection voltage
380
Note 1
Notes 1.
2.
No
If reset is generated again during this period, initialization processing is not started.
A flowchart is shown on the next page.
Figure 22-6. Example of Software Processing After Release of Reset (1/2)
50 ms has passed?
Check stabilization
Change CPU clock
Checking cause
(TMIFH1 = 1?)
(set to 50 ms)
of oscillation
of reset
Initialization
processing
Start timer
Reset
LVI
Yes
Note 2
CHAPTER 22 LOW-VOLTAGE DETECTOR
User’s Manual U16962EJ3V0UD
; The
;
;
;
;
;
;
The cause of reset (power-on-clear, WDT, LVI, or clock monitor)
can be identified by the RESF register.
8-bit timer H1 can operate with the internal oscillation clock.
Source: f
(f
Check the stabilization of oscillation of the high-speed system clock
Change the CPU clock from the internal oscillation clock to the high-speed
TMIFH1 = 1: Interrupt request is generated.
Initialization of ports
by using the OSTC register.
system clock.
R
: internal oscillation clock oscillation frequency)
internal oscillation clock is set as the CPU clock when the reset signal is generated
R
(480 kHz (MAX.))/2
7
× compare value 200 = 53 ms