HD64F3694H Renesas Electronics America, HD64F3694H Datasheet - Page 213

• Manufacturer Part Number: HD64F3694H
• Description: IC H8 MCU FLASH 32K 64QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300H Tinyr

Specifications of HD64F3694H

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: PWM, WDT
• Number Of I /o: 29
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 64-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

The watchdog timer is an 8-bit timer that can generate an internal reset signal for this LSI if a
system crash prevents the CPU from writing to the timer counter, thus allowing it to overflow.
The block diagram of the watchdog timer is shown in figure 13.1.
13.1
WDT0110A_000020020200
Selectable from nine counter input clocks.
Eight clock sources ( /64, /128, /256, /512, /1024, /2048, /4096, and /8192) or the
internal oscillator can be selected as the timer-counter clock. When the internal oscillator is
selected, it can operate as the watchdog timer in any operating mode.
Reset signal generated on counter overflow
An overflow period of 1 to 256 times the selected clock can be set.
Features
[Legend]
TCSRWD: Timer control/status register WD
TCWD:
PSS:
TMWD:
oscillator
Internal
Timer counter WD
Prescaler S
Timer mode register WD
Figure 13.1 Block Diagram of Watchdog Timer
Section 13 Watchdog Timer
CLK
PSS
TCSRWD
TCWD
TMWD
Rev.5.00 Nov. 02, 2005 Page 183 of 418
Section 13 Watchdog Timer
Internal reset
signal
REJ09B0028-0500