DF2148ATE20 Renesas Electronics America, DF2148ATE20 Datasheet - Page 463

• Manufacturer Part Number: DF2148ATE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148ATE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: Host Interface, I²C, IrDA, SCI
• Peripherals: POR, 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 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: HD64F2148ATE20; HD64F2148ATE20

14.3.2
To use the WDT as an interval timer, clear the WT/IT bit in TCSR to 0 and set the TME bit to 1.
An interval timer interrupt (WOVI) is generated each time TCNT overflows, provided that the
WDT is operating as an interval timer, as shown in figure 14.4. This function can be used to
generate interrupt requests at regular intervals.
RESO signal
Internal reset signal
Legend:
WT/IT: Timer mode select bit
TME:
OVF:
Note: * Cleared to 0 by an internal reset when OVF is set to 1. XRST is cleared to 0.
Interval Timer Operation
Timer enable bit
Overflow flag
Figure 14.3 Operation in Watchdog Timer Mode (RST/NMI
H'FF
H'00
TCNT value
WT/IT = 1
TME = 1
H'00 written
to TCNT
RESO and internal
reset generated
Overflow
OVF = 1 *
Rev. 4.00 Sep 27, 2006 page 417 of 1130
132 system
clock periods
518 system
clock periods
Section 14 Watchdog Timer (WDT)
WT/IT = 1
TME = 1
NMI = 1)
NMI
NMI
H'00 written
to TCNT
REJ09B0327-0400
Time