UPD78F0550MA-FAA-AX Renesas Electronics America, UPD78F0550MA-FAA-AX Datasheet - Page 337

• Manufacturer Part Number: UPD78F0550MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0550MA-FAA-AX

• Package / Case: *
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Speed: 10MHz
• Number Of I /o: 12
• Core Processor: 78K/0
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Program Memory Size: 4KB (4K x 8)
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Peripherals: LVD, POR, PWM, WDT
• Connectivity: I²C, LIN, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

9.4.3 Setting window open period of watchdog timer
byte (0080H). The outline of the window is as follows.
Set the window open period of the watchdog timer by using bits 6 and 5 (WINDOW1, WINDOW0) of the option
Example: If the window open period is 25%
Caution The first writing to WDTE after a reset release clears the watchdog timer, if it is made before the
The window open period to be set is as follows.
Counting
starts
If “ACH” is written to WDTE during the window open period, the watchdog timer is cleared and starts counting
again.
Even if “ACH” is written to WDTE during the window close period, an abnormality is detected and an internal
reset signal is generated.
Cautions 1. The combination of WDCS2 = WDCS1 = WDCS0 = 0 and WINDOW1 = WINDOW0 = 0
overflow time regardless of the timing of the writing, and the watchdog timer starts counting
again.
WINDOW1
0
0
1
1
Internal reset signal is generated
if ACH is written to WDTE.
Window close period (75%)
2. The watchdog timer continues its operation during self-programming and EEPROM
is prohibited.
emulation of the flash memory. During processing, the interrupt acknowledge time
is delayed.
consideration.
Table 9-4. Setting Window Open Period of Watchdog Timer
WINDOW0
1
0
1
0
25%
50%
75%
100%
Preliminary User’s Manual U19111EJ2V1UD
CHAPTER 9 WATCHDOG TIMER
Set the overflow time and window size taking this delay into
Window Open Period of Watchdog Timer
Counting starts again when
ACH is written to WDTE.
Window open
period (25%)
Overflow
time
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