DF61657CN35FTV Renesas Electronics America, DF61657CN35FTV Datasheet - Page 572

• Manufacturer Part Number: DF61657CN35FTV
• Description: IC H8SX/1657 MCU FLASH 120TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8SX/1600r

Specifications of DF61657CN35FTV

• Core Processor: H8SX
• Core Size: 32-Bit
• Speed: 35MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 82
• Program Memory Size: 768KB (768K x 8)
• Program Memory Type: FLASH
• Ram Size: 24K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 120-TQFP, 120-VQFP
• For Use With: 3DK1657 - DEV EVAL KIT FOR H8SX/1657
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 13 Watchdog Timer (WDT)
13.5
During interval timer mode operation, an overflow generates an interval timer interrupt (WOVI).
The interval timer interrupt is requested whenever the OVF flag is set to 1 in TCSR. The OVF flag
must be cleared to 0 in the interrupt handling routine.
Table 13.2 WDT Interrupt Source
13.6
13.6.1
The watchdog timer's TCNT, TCSR, and RSTCSR registers differ from other registers in being
more difficult to write to. The procedures for writing to and reading these registers are given
below.
(1)
TCNT and TCSR must be written to by a word transfer instruction. They cannot be written to by a
byte transfer instruction.
For writing, TCNT and TCSR are assigned to the same address. Accordingly, perform data
transfer as shown in figure 13.4. The transfer instruction writes the lower byte data to TCNT or
TCSR.
To write to RSTCSR, execute a word transfer instruction for address H'FFA6. A byte transfer
instruction cannot be used to write to RSTCSR.
The method of writing 0 to the WOVF bit in RSTCSR differs from that of writing to the RSTE bit
in RSTCSR. Perform data transfer as shown in figure 13.4.
At data transfer, the transfer instruction clears the WOVF bit to 0, but has no effect on the RSTE
bit. To write to the RSTE bit, perform data transfer as shown in figure 13.4. In this case, the
transfer instruction writes the value in bit 6 of the lower byte to the RSTE bit, but has no effect on
the WOVF bit.
Rev. 2.00 Jun. 28, 2007 Page 546 of 864
REJ09B0341-0200
Name
WOVI
Writing to TCNT, TCSR, and RSTCSR
Interrupt Source
Usage Notes
Notes on Register Access
Interrupt Source
TCNT overflow
Interrupt Flag
OVF
DTC Activation
Impossible