参数资料
型号: PC87393F-VJG
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 外设及接口
英文描述: 100-Pin LPC SuperI/O Devices for Portable Applications
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封装: TQFP-100
文件页数: 129/148页
文件大小: 1733K
代理商: PC87393F-VJG
4.0 WATCHDOG Timer (WDT) (Continued)
81
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4.3
WATCHDOG TIMER REGISTERS
The WATCHDOG Timer registers at offsets 00h-02h relative to the WATCHDOG base address, are shown in the following
register map. The base address is defined by designated registers in the WATCHDOG Timer device configuration register
set.
The following abbreviations are used to indicate the Register Type:
R/W
= Read/Write
R
= Read from a specific address returns the value of a specific register. Write to the same address is to a different register.
W
= Write
RO
= Read Only
R/W1C = Read/Write 1 to Clear. Writing 1 to a bit clears it to 0. Writing 0 has no effect.
4.3.1
WATCHDOG Timer Register Map
4.3.2
WATCHDOG Timeout Register (WDTO)
This register holds the programmable timeout period, between 1 and 255 minutes. Writing to this register de-asserts the
WDO output and sets the WDO status bit to 1 (inactive). Additionally, writing to this register is interpreted as a command for
starting or stopping the WATCHDOG Timer, according to the data written. If a non-zero value is written, the timer is activated
(countdown starts). If a non-zero value is written when the counter is running, the timer is immediately reloaded with the new
value and starts counting down from the new value. If 00h is written, the timer and its outputs are de-activated.
Location:
Offset 00h
Type:
R/W
Offset Mnemonic
Register Name
Type
Section
00h
WDTO
WATCHDOG Timeout
R/W
01h
WDMSK
WATCHDOG Mask
R/W
02h
WDST
WATCHDOG Status
RO
03h
Reserved
Bit
76543210
Name
Programmed Timeout Period
Reset
00000000
Bit
Description
7-0
Programmed Timeout Period. These bits hold the binary value of the timeout period in minutes (1 to 255). A
value of 00h halts the counter and forces the outputs to inactive levels. A device reset clears the register to 00h.
00h: Timer and WDO outputs inactive
01h-FFh: Programmed timeout period (in minutes)
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