DF71241D50FPV Renesas Electronics America, DF71241D50FPV Datasheet - Page 426

• Manufacturer Part Number: DF71241D50FPV
• Description: MCU RISC FLASH 5V 32K 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Tinyr

Specifications of DF71241D50FPV

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

11.3
The WDT has the following two registers. Refer to section 20, List of Registers, for the details of
the addresses of these registers and the state of registers in each operating mode.
Table 11.2 Register Configuration
11.3.1
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. 5.00 Mar. 06, 2009 Page 406 of 770
REJ09B0243-0500
Register Name
Watchdog timer counter
Watchdog timer control/status
register
11.3.3, 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
H'FFFFE810
H'FFFFE812
Address
R/W
0
0
Access Size
8, 16
8, 16