UPD78F0550MA-FAA-AX Renesas Electronics America, UPD78F0550MA-FAA-AX Datasheet - Page 334

• 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: -

9.3 Register Controlling Watchdog Timer
334
The watchdog timer is controlled by the watchdog timer enable register (WDTE).
(1) Watchdog timer enable register (WDTE)
Writing ACH to WDTE clears the watchdog timer counter and starts counting again.
This register can be set by an 8-bit memory manipulation instruction.
Reset signal generation sets this register to 9AH or 1AH
Note The WDTE reset value differs depending on the WDTON setting value of the option byte (0080H). To
Cautions 1. If a value other than ACH is written to WDTE, an internal reset signal is generated. If the
Address: FF99H
Symbol
WDTE
operate watchdog timer, set WDTON to 1.
2. If a 1-bit memory manipulation instruction is executed for WDTE, an internal reset signal
3. The value read from WDTE is 9AH/1AH (this differs from the written value (ACH)).
0 (watchdog timer count operation disabled)
1 (watchdog timer count operation enabled)
source clock to the watchdog timer is stopped, however, an internal reset signal is
generated when the source clock to the watchdog timer resumes operation.
is generated. If the source clock to the watchdog timer is stopped, however, an internal
reset signal is generated when the source clock to the watchdog timer resumes operation.
7
Figure 9-2. Format of Watchdog Timer Enable Register (WDTE)
After reset: 9AH/1AH
WDTON Setting Value
6
Preliminary User’s Manual U19111EJ2V1UD
CHAPTER 9 WATCHDOG TIMER
Note
5
R/W
4
Note
.
1AH
9AH
3
WDTE Reset Value
2
1
0