C8051F020 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F020

8K ISP FLASH MCU Family

Silicon Laboratories 

C8051F020/1/2/3

Figure 13.3. WDTCN: Watchdog Timer Control Register

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

Reset Value

xxxxx111

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0 SFR Address:

0xFF

Bits7-0:

Bit4:

Bits2-0:

WDT Control

Writing 0xA5 both enables and reloads the WDT.

Writing 0xDE followed within 4 system clocks by 0xAD disables the WDT.

Writing 0xFF locks out the disable feature.

Watchdog Status Bit (when Read)

Reading the WDTCN.[4] bit indicates the Watchdog Timer Status.

0: WDT is inactive

1: WDT is active

Watchdog Timeout Interval Bits

The WDTCN.[2:0] bits set the Watchdog Timeout Interval. When writing these bits, WDTCN.7 must

be set to 0.

Rev. 1.4

131

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