HD6417144F50V Renesas Electronics America, HD6417144F50V Datasheet - Page 428

• Manufacturer Part Number: HD6417144F50V
• Description: IC SUPERH MCU ROMLESS 112QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7144r

Specifications of HD6417144F50V

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, I²C, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Type: ROMless
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 112-QFP
• For Use With: HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)EDK7145 - DEV EVALUATION KIT SH7145
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

12. Watchdog Timer
12.3.2
TCSR is an 8-bit readable/writable register. Its functions include selecting the clock source to be
input to TCNT, and the timer mode.
Rev.4.00 Mar. 27, 2008 Page 382 of 882
REJ09B0108-0400
Bit
7
6
5
Bit Name
OVF
WT/IT
TME
Timer Control/Status Register (TCSR)
0
0
Initial Value
0
R/W
R/(W)*
R/W
R/W
1
Description
Overflow Flag
Indicates that TCNT has overflowed in interval timer
mode. Only a write of 0 is permitted, to clear the
flag. This flag is not set in watchdog timer mode.
[Setting condition]
•
[Clearing condition]
•
Timer Mode Select
Selects whether the WDT is used as a watchdog
timer or interval timer. When TCNT overflows, the
WDT either generates an interval timer interrupt
(ITI) or generates a WDTOVF signal, depending on
the mode selected.
0: Interval timer mode
1: Watchdog timer mode
Timer Enable
Enables or disables the timer.
0: Timer disabled
1: Timer enabled
Interval timer interrupt (ITI) request to the CPU
when TCNT overflows
WDTOVF signal output externally when TCNT
overflows.
For details on the TCNT overflow in watchdog
timer mode, see section 12.3.3, Reset
Control/Status Register (RSTCSR).
TCNT is initialized to H'00 and count-up stops
TCNT starts counting. A WDTOVF signal or
interrupt is generated when TCNT overflows.
When TCNT overflows in interval timer mode.
When writing 0 to this bit after reading this bit or
when writing 0 to the TME bit in interval timer
mode.