upd78f0103 Renesas Electronics Corporation., upd78f0103 Datasheet - Page 335

• Manufacturer Part Number: upd78f0103
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

Note 1
If supply voltage fluctuation is 50 ms or less in vicinity of LVI detection voltage
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 19-6. Example of Software Processing After Release of Reset (1/2)
50 ms has passed?
Change CPU clock
Check stabilization
Checking cause
(TMIFH1 = 1?)
(set to 50 ms)
of oscillation
of reset
Initialization
processing
Start timer
Reset
LVI
Yes
Note 2
CHAPTER 19 LOW-VOLTAGE DETECTOR
User’s Manual U15836EJ5V0UD
; 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 Ring-OSC clock.
Source: f
(f
Check the stabilization of oscillation of the X1 input clock by using the
OSTC register.
Change the CPU clock from the Ring-OSC clock to the X1 input clock.
TMIFH1 = 1: Interrupt request is generated.
Initialization of ports
R
: Ring-OSC clock oscillation frequency)
Ring-OSC clock is set as the CPU clock when the reset signal is generated
R
(480 kHz (MAX.))/2
7
compare value 200 = 53 ms
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