UPD78F0500AMC-CAB-AX Renesas Electronics America, UPD78F0500AMC-CAB-AX Datasheet - Page 396

• Manufacturer Part Number: UPD78F0500AMC-CAB-AX
• Description: MCU 8BIT 30SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2r

Specifications of UPD78F0500AMC-CAB-AX

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 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: -

78K0/Kx2
11.1 Functions of Watchdog Timer
signal is generated.
details of RESF, see CHAPTER 23 RESET FUNCTION.
R01UH0008EJ0401 Rev.4.01
Jul 15, 2010
The watchdog timer is mounted onto all 78K0/Kx2 microcontroller products.
The watchdog timer operates on the internal low-speed oscillation clock.
The watchdog timer is used to detect an inadvertent program loop. If a program loop is detected, an internal reset
Program loop is detected in the following cases.
• If the watchdog timer counter overflows
• If a 1-bit manipulation instruction is executed on the watchdog timer enable register (WDTE)
• If data other than “ACH” is written to WDTE
• If data is written to WDTE during a window close period
• If the instruction is fetched from an area not set by the IMS and IXS registers (detection of an invalid check while the
• If the CPU accesses an area that is not set by the IMS and IXS registers (excluding FB00H to FFCFH and FFE0H to
When a reset occurs due to the watchdog timer, bit 4 (WDTRF) of the reset control flag register (RESF) is set to 1. For
CPU hangs up)
FFFFH) by executing a read/write instruction (detection of an abnormal access during a CPU program loop)
CHAPTER 11 WATCHDOG TIMER
CHAPTER 11 WATCHDOG TIMER
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