W78L801A24LL Nuvoton Technology Corporation of America, W78L801A24LL Datasheet - Page 11

• Manufacturer Part Number: W78L801A24LL
• Description: IC MCU 8-BIT 4K ROM 48-LQFP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: W78r

Specifications of W78L801A24LL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: EBI/EMI
• Peripherals: LED, WDT
• Number Of I /o: 36
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: Mask ROM
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

Watchdog Timer Control Register
ENW : Enable watch-dog if set.
CLRW : Clear watch-dog timer and prescaler if set. This flag will be cleared automatically
WIDL : If this bit is set, watch-dog is enabled under IDLE mode. If cleared, watch-dog is disabled
PS2, PS1, PS0: Watch-dog prescaler timer select. Prescaler is selected when set PS2 − 0 as
The time-out period is obtained using the following formula:
Before Watchdog time-out occurs, the program must clear the 14-bit timer by writing 1 to WDTC.6
(CLRW). After 1 is written to this bit, the 14-bit timer, prescaler and this bit will be reset on the next
instruction cycle. The Watchdog timer is cleared on reset.
OSC
1
×
WIDL
IDLE
Watchdog Timer Block Diagram
2
OSC
14
under IDLE mode. Default is cleared.
×
PRESCALER 1000 12 mS
PS2 PS1 PS0
0
0
0
0
1
1
1
1
follows:
1/12
0
1
0
1
0
0
1
1
Bit:
0
0
1
1
0
1
0
1
ENW
×
Mnemonic: WDTC
7
ENW
×
CLRW
6
WIDL
PRESCALER
- 11 -
5
CLRW
EXTERNAL
Address: 8FH
RESET
4
-
14-BIT TIMER
PRESCALER SELECT
Publication Release Date: June 04, 2006
CLEAR
3
-
128
256
16
32
64
2
4
8
PS2
2
PS1
W78L801
1
INTERNAL
RESET
Revision A10
PS0
0