DF2148BTE20 Renesas Electronics America, DF2148BTE20 Datasheet - Page 403

• Manufacturer Part Number: DF2148BTE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148BTE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, IrDA, SCI, X-Bus
• Peripherals: PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2148BTE20; HD64F2148BTE20

14.2
The WDT has the pins listed in table 14.1.
Table 14.1 Pin Configuration
14.3
The WDT has the following registers. To prevent accidental overwriting, TCSR and TCNT have
to be written to in a method different from normal registers. For details, refer to section 14.6.1,
Notes on Register Access. For details on the system control register, refer to section 3.2.2, System
Control Register (SYSCR).
14.3.1
TCNT is an 8-bit readable/writable up-counter.
TCNT is initialized to H'00 when the TME bit in the timer control/status register (TCSR) is
cleared to 0.
Name
Reset output pin
External sub-clock input
pin
Timer counter (TCNT)
Timer control/status register (TCSR)
Register Descriptions
Timer Counter (TCNT)
Input/Output Pins
Symbol
RESO
EXCL
I/O
Output
Input
Function
Outputs the counter overflow signal in
watchdog timer mode
prescaler counter
Inputs the clock pulses to the WDT_1
Rev. 3.00 Mar 21, 2006 page 347 of 788
Section 14 Watchdog Timer (WDT)
REJ09B0300-0300