UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 260

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: 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
260
Note
No
A flowchart is shown on the next page.
(TMHE1 = 0 → TMHE1 = 1)
Detection voltage or more
Restarting the timer H1
Setting 8-bit timer H1
(50 ms
50 ms has passed?
Figure 16-6. Example of Software Processing After Release of Reset (1/2)
processing <1>
processing <2>
(TMIFH1 = 1?)
Clears WDT
Initialization
Initialization
(LVIF = 0 ?)
Setting LVI
LVIF = 0
Reset
is measured)
No
Yes
LVI reset
CHAPTER 16 LOW-VOLTAGE DETECTOR
Yes
; Check reset source
User’s Manual U16898EJ5V0UD
; The detection level is set with LVIS.
; Setting
; f
; Clear low-voltage detection flag.
; Clear timer counter and timer starts.
Initialization of ports
Setting WDT
The low-voltage detector is operated (LVION = 1)
timer, A/D converter, etc.
Source: f
Timer starts (TMHE1 = 1)
XP
= High-speed internal oscillation clock (8.4 MHz (MAX.))/2
the division ratio of the system clock,
51 ms when the compare value is 25
XP
(2.1 MHz (MAX.))/2
Note
12
,
2
(default value)