DF2268FA13V Renesas Electronics America, DF2268FA13V Datasheet - Page 343

• 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: -

12.2
The WDT has the following registers. To prevent accidental overwriting, TCSR and TCNT have
to be written to by a different method to normal registers. For details, refer to section 12.5.1, Notes
on Register Access.
• Timer counter (TCNT)
• Timer control/status register (TCSR)
• Reset control/status register (RSTCSR)
12.2.1
TCNT is an 8-bit readable/writable up-counter. TCNT is initialized to H'00 when the TME bit in
TCSR is cleared to 0.
To initialize TCNT to H’00 while the timer is operating, write H’00 to TCNT directly. See 12.5.7,
Notes on Initializing TCNT by Using the TME Bit.
12.2.2
TCSR functions include selecting the clock source to be input to TCNT and the timer mode.
• TCSR_0
Bit
7
Timer Control/Status Register (TCSR)
Bit Name
OVF
Register Descriptions
Timer Counter (TCNT)
Initial
Value
0
R/W
R/(W) *
1
Description
Overflow Flag
Indicates that TCNT has overflowed. Only a 0 can be
written to this bit, to clear the flag.
[Setting condition]
When TCNT overflows (changes from H'FF to H'00)
When internal reset request generation is selected in
watchdog timer mode, OVF is cleared automatically by
the internal reset.
[Clearing condition]
Cleared by reading TCSR *
to OVF
Rev. 5.00 Sep. 01, 2009 Page 291 of 656
Section 12 Watchdog Timer (WDT)
2
when OVF = 1, then writing 0
REJ09B0071-0500