W90N740CDG Nuvoton Technology Corporation of America, W90N740CDG Datasheet - Page 158

• Manufacturer Part Number: W90N740CDG
• Description: IC MCU ARM7 TDMI 176-LQFP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: W90r

Specifications of W90N740CDG

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 80MHz
• Connectivity: EBI/EMI, Ethernet, UART/USART, USB
• Peripherals: DMA, POR, WDT
• Number Of I /o: 21
• Program Memory Type: ROMless
• Ram Size: 10K x 8
• Voltage - Supply (vcc/vdd): 1.62 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 176-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

WTE [7]: Watchdog Timer Enable
0 = Disable the watchdog timer
1 = Enable the watchdog timer
WTIE [6]: Watchdog Timer Interrupt Enable
0 = Disable the watchdog timer interrupt
1 = Enable the watchdog timer interrupt
WTIS [5:4]: Watchdog Timer Interval Select
These two bits select the interval for the watchdog timer. No matter which interval is chosen, the reset
time-out is always occurred 512 clocks later than the interrupt time-out.
WTIF [3]: Watchdog Timer Interrupt Flag
If the watchdog interrupt is enabled, then the hardware will set this bit to indicate that the watchdog
interrupt has occurred. If the watchdog interrupt is not enabled, then this bit indicates that a time-out
period has elapsed.
0 = Watchdog timer interrupt does not occur
1 = Watchdog timer interrupt occurs
WTRF [2]: Watchdog Timer Reset Flag
When the watchdog timer initiates a reset, the hardware will set this bit. This flag can be read by software
to determine the source of reset. Software is responsible to clear it up manually. If WTRE is disabled,
then the watchdog timer has no effect on this bit.
0 = Watchdog timer reset does not occur
1 = Watchdog timer reset occurs
WTRE [1]: Watchdog Timer Reset Enable
Setting this bit will enable the watchdog timer reset function.
0 = Disable watchdog timer reset function
1 = Enable watchdog timer reset function
WTIS [5:4]
00
01
10
11
INTERRUPT TIME-OUT
2
2
2
2
21
22
23
24
clocks
clocks
clocks
clocks
- 155 -
W90N740CD/W90N740CDG
Publication Release Date: Aug. 18, 2005
RESET TIME-OUT
2
2
2
2
21
22
23
24
+ 512 clocks
+ 512 clocks
+ 512 clocks
+ 512 clocks
Revision A6