DF70844AD80FPV Renesas Electronics America, DF70844AD80FPV Datasheet - Page 774

• Manufacturer Part Number: DF70844AD80FPV
• Description: IC SUPERH MCU FLASH 112LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7080r

Specifications of DF70844AD80FPV

• Core Size: 32-Bit
• Program Memory Size: 256KB (256K x 8)
• Core Processor: SH-2
• Speed: 80MHz
• Connectivity: EBI/EMI, FIFO, I²C, SCI, SSU
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 76
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 112-LQFP
• No. Of I/o's: 76
• Ram Memory Size: 16KB
• Cpu Speed: 80MHz
• Digital Ic Case Style: LQFP
• Supply Voltage Range: 3V To 3.6V, 4.5V To 5.5V
• Embedded Interface Type: I2C, SCI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: R0K570865S001BE - KIT STARTER FOR SH7086R0K570865S000BE - KIT STARTER FOR SH7086HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Section 14 Watchdog Timer (WDT)
14.3
The WDT has the following two registers. Refer to section 27, List of Registers, for the details of
the addresses of these registers and the state of registers in each operating mode.
Table 14.2 Register Configuration
14.3.1
WTCNT is an 8-bit readable/writable register that increments on the selected clock. When an
overflow occurs, it generates a reset in watchdog timer mode and an interrupt in interval time
mode. The WTCNT counter is not initialized by an internal reset due to the WDT overflow. The
WTCNT counter is initialized to H'00 only by a power-on reset using the RES pin. Use a word
access to write to the WTCNT counter, with H'5A in the upper byte. Use a byte access to read
WTCNT.
Note: WTCNT differs from other registers in that it is more difficult to write to. See section
Rev. 3.00 May 17, 2007 Page 716 of 1582
REJ09B0181-0300
Register Name
Watchdog timer counter
Watchdog timer control/status
register
14.3.3, Notes on Register Access, for details.
Register Descriptions
Watchdog Timer Counter (WTCNT)
Initial value:
R/W:
Bit:
R/W
Abbrevia-
tion
WTCNT
WTCSR
7
0
R/W
6
0
R/W
5
0
R/W
R/W
R/W
R/W
4
0
Initial Value
H'00
H'00
R/W
3
0
R/W
2
0
R/W
1
0
Address
H'FFFFE810
H'FFFFE812
R/W
0
0
Access Size
8, 16
8, 16