HD64F3644H Renesas Electronics America, HD64F3644H Datasheet - Page 292

• Manufacturer Part Number: HD64F3644H
• Description: IC H8 MCU FLASH 32K 64-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Lr

Specifications of HD64F3644H

• Core Processor: H8/300L
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 64-QFP
• Package: 64PQFP
• Family Name: H8
• Maximum Speed: 8 MHz
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 45
• Interface Type: SCI
• On-chip Adc: 8-chx8-bit
• Number Of Timers: 4
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Section 9 Timers
9.6
9.6.1
The watchdog timer has an 8-bit counter that is incremented by an input clock. If a system
runaway allows the counter value to overflow before being rewritten, the watchdog timer can reset
the chip internally.
Features
Features of the watchdog timer are given below.
Block Diagram
Figure 9.35 shows a block diagram of the watchdog timer.
Rev. 6.00 Sep 12, 2006 page 270 of 526
REJ09B0326-0600
Legend:
TCSRW:
TCW:
PSS:
Incremented by internal clock source ( /8192).
A reset signal is generated when the counter overflows. The overflow period can be set from 1
to 256 times 8192/ (from approximately 2 ms to 500 ms when = 4.19 MHz).
Overview
Watchdog Timer
Timer control/status register W
Timer counter W
Prescaler S
PSS
Figure 9.35 Block Diagram of Watchdog Timer
/8192
TCSRW
TCW
Internal reset
signal