DF2148ATE20 Renesas Electronics America, DF2148ATE20 Datasheet - Page 466

• 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

Section 14 Watchdog Timer (WDT)
14.5
14.5.1
If a timer counter clock pulse is generated during the T
takes priority and the timer counter is not incremented. Figure 14.7 shows this operation.
14.5.2
If bits CKS2 to CKS0 in TCSR are written to while the WDT is operating, errors could occur in
the incrementation. Software must stop the watchdog timer (by clearing the TME bit to 0) before
changing the value of bits CKS2 to CKS0.
Rev. 4.00 Sep 27, 2006 page 420 of 1130
REJ09B0327-0400
Usage Notes
Contention between Timer Counter (TCNT) Write and Increment
Changing Value of CKS2 to CKS0
Address
Internal write signal
TCNT input clock
TCNT
Figure 14.7 Contention between TCNT Write and Increment
TCNT write cycle
T
1
N
2
T
state of a TCNT write cycle, the write
2
Counter write data
M