DF2268FA13V Renesas Electronics America, DF2268FA13V Datasheet - Page 346

• Manufacturer Part Number: DF2268FA13V
• Description: IC H8S/2268 MCU FLASH 100QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2200r

Specifications of DF2268FA13V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 13MHz
• Connectivity: I²C, SCI, SmartCard
• Peripherals: LCD, POR, PWM, WDT
• Number Of I /o: 67
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 10x10b, D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 12 Watchdog Timer (WDT)
Notes: 1. Only 0 can be written, for flag clearing.
Rev. 5.00 Sep. 01, 2009 Page 294 of 656
REJ09B0071-0500
2
1
0
Bit
2. When the OVF flag is polled with the interval timer interrupt disabled, read the OVF bit
3. The overflow period is the time from when TCNT starts counting up from H'00 until
Bit Name
CKS2
CKS1
CKS0
while it is 1 at least twice
overflow occurs.
Initial
Value
0
0
0
R/W
R/W
R/W
R/W
Description
Clock Select 0 to 2
Selects the clock source to be input to TCNT. The
overflow frequency *
is enclosed in parentheses.
When PSS = 0:
000: Clock φ/2 (frequency: 25.6 μs)
001: Clock φ/64 (frequency: 819.2 μs)
010: Clock φ/128 (frequency: 1.6 ms)
011: Clock φ/512 (frequency: 6.6 ms)
100: Clock φ/2048 (frequency: 26.2 ms)
101: Clock φ/8192 (frequency: 104.9 ms)
110: Clock φ/32768 (frequency: 419.4 ms)
111: Clock φ/131072 (frequency: 1.68 s)
When PSS = 1:
000: Clock φ
001: Clock φ
010: Clock φ
011: Clock φ
100: Clock φ
101: Clock φ
110: Clock φ
111: Clock φ
SUB
SUB
SUB
SUB
SUB
SUB
SUB
SUB
/2 (frequency: 15.6 ms)
/4 (frequency: 31.3 ms)
/8 (frequency: 62.5 ms)
/16 (frequency: 125 ms)
/32 (frequency: 250 ms)
/64 (frequency: 500 ms)
/128 (frequency: 1 s)
/256 (frequency: 2 s)
3
for φ = 20 MHz or φ
SUB
= 32.768 kHz