R5F61665N50FPV Renesas Electronics America, R5F61665N50FPV Datasheet - Page 888

• Manufacturer Part Number: R5F61665N50FPV
• Description: MCU FLASH 512K ROM 144-LQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8SX/1600r

Specifications of R5F61665N50FPV

• Core Processor: H8SX
• Core Size: 16/32-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, I²C, IrDA, SCI, SmartCard, USB
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 92
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 40K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 18 Watchdog Timer (WDT)
Note:
Rev. 2.00 Oct. 21, 2009 Page 854 of 1454
REJ09B0498-0200
Bit
7
6
5
4, 3
2
1
0
*
Bit Name
OVF
WT/IT
TME
⎯
CKS2
CKS1
CKS0
Only 0 can be written to this bit, to clear the flag.
Initial
Value
0
0
0
All 1
0
0
0
R/W
R/(W)* Overflow Flag
R/W
R/W
R
R/W
R/W
R/W
Description
Indicates that TCNT has overflowed in interval timer
mode. Only 0 can be written to this bit, to clear the flag.
[Setting condition]
When TCNT overflows in interval timer mode (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 when OVF = 1, then writing 0
to OVF
(When the CPU is used to clear this flag while the
corresponding interrupt is enabled, be sure to read the
flag after writing 0 to it.)
Timer Mode Select
Selects whether the WDT is used as a watchdog timer or
interval timer.
0: Interval timer mode
1: Watchdog timer mode
Timer Enable
When this bit is set to 1, TCNT starts counting. When this
bit is cleared, TCNT stops counting and is initialized to
H'00.
Reserved
These are read-only bits and cannot be modified.
Clock Select 2 to 0
Select the clock source to be input to TCNT. The overflow
cycle for Pφ = 20 MHz is indicated in parentheses.
000: Clock Pφ/2 (cycle: 25.6 μs)
001: Clock Pφ/64 (cycle: 819.2 μs)
010: Clock Pφ/128 (cycle: 1.6 ms)
011: Clock Pφ/512 (cycle: 6.6 ms)
100: Clock Pφ/2048 (cycle: 26.2 ms)
101: Clock Pφ/8192 (cycle: 104.9 ms)
110: Clock Pφ/32768 (cycle: 419.4 ms)
111: Clock Pφ/131072 (cycle: 1.68 s)
When TCNT overflows, an interval timer interrupt
(WOVI) is requested.
When TCNT overflows, the WDTOVF signal is output.