UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 562

• Manufacturer Part Number: UPD78F0537DGA(T)-9EV-A
• Description: 8BIT MCU, 128K FLASH, 7KB RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F0537DGA(T)-9EV-A

• Controller Family/series: UPD78
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

<R>
• If supply voltage fluctuation is 50 ms or less in vicinity of LVI detection voltage
562
Note A flowchart is shown on the next page.
No
(TMHE1 = 0 → TMHE1 = 1)
Setting 8-bit timer H1
50 ms have passed?
Figure 24-9. Example of Software Processing After Reset Release (1/2)
(to measure 50 ms)
Restarting timer H1
voltage or higher
processing <1>
processing <2>
(TMIFH1 = 1?)
Clearing WDT
Initialization
Initialization
(LVIF = 0?)
Detection
Reset
No
Yes
LVI reset
CHAPTER 24 LOW-VOLTAGE DETECTOR
Yes
User’s Manual U17260EJ6V0UD
;
; 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.
Source: f
Timer starts (TMHE1 = 1).
such as setting of timer or A/D converter
PRS
= Internal high-speed oscillation clock (8.4 MHz (MAX.)) (default)
Where comparison value = 102: ≅ 50 ms
PRS
(8.4 MHz (MAX.))/2
Note
12
,