UPD78F0138HGK-9ET-A Renesas Electronics America, UPD78F0138HGK-9ET-A Datasheet - Page 234

• Manufacturer Part Number: UPD78F0138HGK-9ET-A
• Description: MCU 8BIT 60K FLASH 64TQFP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx1+r

Specifications of UPD78F0138HGK-9ET-A

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: 3-Wire SIO, LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 42
• Program Memory Size: 60KB (60K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

10.1 Functions of Watchdog Timer
signal is generated.
For details of RESF, refer to CHAPTER 20 RESET FUNCTION.
internal oscillator as shown in Table 10-2.
232
The watchdog timer is used to detect an inadvertent program loop. If a program loop is detected, an internal reset
When a reset occurs due to the watchdog timer, bit 4 (WDTRF) of the reset control flag register (RESF) is set to 1.
The operation mode of the watchdog timer (WDT) is switched according to the option byte setting of the on-chip
Remarks 1. f
2
2
2
2
2
2
2
2
11
12
13
14
15
16
17
18
During Internal Oscillation Clock Operation
/f
/f
/f
/f
/f
/f
/f
/f
R
R
R
R
R
R
R
R
(4.27 ms)
(8.53 ms)
(17.07 ms)
(34.13 ms)
(68.27 ms)
(136.53 ms)
(273.07 ms)
(546.13 ms)
2. f
3. Figures in parentheses apply to operation at f
Table 10-1. Loop Detection Time of Watchdog Timer
R
XP
: Internal oscillation clock oscillation frequency
: High-speed system clock oscillation frequency
CHAPTER 10 WATCHDOG TIMER
User’s Manual U16899EJ3V0UD
Loop Detection Time
2
2
2
2
2
2
2
2
During High-Speed System Clock Operation
13
14
15
16
17
18
19
20
/f
/f
/f
/f
/f
/f
/f
/f
XP
XP
XP
XP
XP
XP
XP
XP
(819.2 s)
(1.64 ms)
(3.28 ms)
(6.55 ms)
(13.11 ms)
(26.21 ms)
(52.43 ms)
(104.86 ms)
R
= 480 kHz (MAX.), f
XP
= 10 MHz