參數(shù)資料
型號： XE8000EV104
廠商： Semtech
文件頁數(shù)： 89/156頁
文件大?。?/td> 0K
描述： EVAL BOARD FOR XE8805AMI028LF
標準包裝： 1
類型： MCU
適用于相關(guān)產(chǎn)品： XE88LC05AMI028
所含物品： 完全組裝的評估板
Semtech 2006
www.semtech.com
6-3
XE8805/05A
Pos.
RegSysWD
Rw
Reset
Function
7 – 4
-
r
0000
unused
WDKey[3]
w
Watchdog Key bit 3
3
WDCounter[3]
r
0 resetcold
Watchdog counter bit 3
WDKey[2]
w
Watchdog Key bit 2
2
WDCounter[2]
r
0 resetcold
Watchdog counter bit 2
WDKey[1]
w
Watchdog Key bit 1
1
WDCounter[1]
r
0 resetcold
Watchdog counter bit 1
WDKey[0]
w
Watchdog Key bit 0
0
WDCounter[0]
r
0 resetcold
Watchdog counter bit 0
Table 6-3. RegSysWD register
6.4
Reset handling capabilities
There are 5 reset sources:
Power On Reset (POR)
External reset from the RESET pin
Programmable Port A input combination
Programmable watchdog timer reset
Programmable BusError reset on processor access outside the allocated memory map
Another reset source is the bit Sleep in the RegSysReset register. This source is fully controlled by software and
is only used during the sleep mode.
Four internal reset signals are generated from these sources and distributed through the system:
resetcold:
is asserted on POR
resetsystem: is asserted when resetcold or any other enabled reset source is active
resetpconf:
is asserted when resetsystem is active and if the EnResPConf bit in the RegSysCtrl register
is set. This reset is generally used in the different ports. It allows to maintain the port
configuration unchanged while the rest of the circuit is reset.
resetsleep:
is asserted when the circuit is in sleep mode
For the circuits XE8801A and XE8805A
(2) For the circuits XE8801 and XE8805
Table 6-4 shows a summary of the dependency of the internal reset signals on the various reset sources. In all the
tables describing the different registers, the reset source is indicated.
Internal reset signals
resetpconf
Asserted
reset source
resetsystem
when
EnResPConf=0
when
EnResPConf=1
resetsleep
resetcold
POR
Asserted
RESET pin (1)
Asserted
RESET pin (2)
Asserted
-
Asserted
-
PortA input
Asserted
-
Asserted
-
Watchdog
Asserted
-
Asserted
-
BusError
Asserted
-
Asserted
-
Sleep
-
Asserted
-
(1)
For the circuits XE8801A and XE8805A
(2) For the circuits XE8801 and XE8805
Table 6-4. Internal reset assertion as a function of the reset source.
Not
Recommended
for
New
Designs
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