DF36054FPJ Renesas Electronics America, DF36054FPJ Datasheet - Page 279

• Manufacturer Part Number: DF36054FPJ
• Description: MCU 3/5V 32K J-TEMP 64-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300H Tinyr

Specifications of DF36054FPJ

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, SCI, SSU
• Peripherals: PWM, WDT
• Number Of I /o: 45
• 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: -40°C ~ 85°C
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F36054FPJ; HD64F36054FPJ

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
[Legend]
WDT: Watchdog timer
SBT: Subtimer
Selectable from nine counter input clocks.
Eight internal clock sources ( /64, /128, /256, /512, /1024, /2048, /4096, and /8192)
or the internal oscillator (WDT and SBT) 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
From subtimer
Timer counter WD
Prescaler S
Timer mode register WD
Figure 13.1 Block Diagram of Watchdog Timer
Section 13 Watchdog Timer
CLK
PSS
w(fw)
TCSRWD
TCWD
TMWD
Rev. 4.00 Mar. 15, 2006 Page 245 of 556
Section 13 Watchdog Timer
Internal reset
signal
REJ09B0026-0400