UPD78F9222MC-5A4-A Renesas Electronics America, UPD78F9222MC-5A4-A Datasheet - Page 265

• Manufacturer Part Number: UPD78F9222MC-5A4-A
• Description: MCU 8BIT 4KB FLASH 20PIN
• Manufacturer: Renesas Electronics America
• Series: 78K0S/Kx1+r

Specifications of UPD78F9222MC-5A4-A

• Core Processor: 78K0S
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 15
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

If supply voltage fluctuation is 50 ms or less in vicinity of LVI detection voltage
Note
No
A flowchart is shown on the next page.
(TMHE1 = 0
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
TMHE1 = 1)
LVI reset
CHAPTER 16 LOW-VOLTAGE DETECTOR
Yes
; Check reset source
; The detection level is set with LVIS.
User’s Manual U16898EJ6V0UD
; 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)
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