HD6417705F133BV Renesas Electronics America, HD6417705F133BV Datasheet - Page 334

• Manufacturer Part Number: HD6417705F133BV
• Description: MPU 3V 0K PB-FREE 208 FP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417705F133BV

• Core Processor: SH-3
• Core Size: 32-Bit
• Speed: 133MHz
• Connectivity: EBI/EMI, FIFO, IrDA, SCI, USB
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 105
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 208-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

Figures 10.1 shows a block diagram of the WDT.
10.2
The WDT has the following two registers. Refer to section 24, List of Registers for the details of
the addresses of these registers and the state of registers in each operating mode.
10.2.1
The watchdog timer counter (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 timer 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
R E S E T P
Use a word access to write to the WTCNT counter, with H'5A in the upper byte. Use a byte access
to read WTCNT.
Rev. 2.00, 09/03, page 286 of 690
Watchdog timer counter (WTCNT)
Watchdog timer control/status register (WTCSR)
cancellation
pin.
Register Descriptions
Watchdog Timer Counter (WTCNT)
Legend
WTCSR:
WTCNT:
Standby
Interrupt
Internal
request
request
reset
Watchdog timer control/status register
Watchdog timer counter
Standby
Interrupt
control
control
control
Reset
Figure 10.1 Block Diagram of WDT
WTCSR
Clock selection
Overflow
Bus interface
WDT
WTCNT
Clock selector
Clock
Divider
Standby
mode
Peripheral
clock