參數(shù)資料
型號: 8XC196LX
英文描述: 8XC196Lx - 8XC196Lx Supplement to 8X196Kx. 8X196Jx. 87C196CA User's Manual
中文描述: 8XC196Lx - 8XC196Lx補編8X196Kx。 8X196Jx。 87C196CA用戶手冊
文件頁數(shù): 91/136頁
文件大小: 659K
代理商: 8XC196LX
9-1
CHAPTER 9
MINIMUM HARDWARE CONSIDERATIONS
This chapter discusses the major hardware consideration differences between the 8XC196L
x
and
the 8XC196K
x
. The 8XC196L
x
has implemented a reset source SFR that reveals the source of
the most recent reset request.
9.1
IDENTIFYING THE RESET SOURCE
The reset source (RSTSRC) register indicates the source of the last reset that the microcontroller
encountered (Figure 9-1). If more than one reset occurs at the same time, all of the corresponding
RSTSRC bits are set. Reading this SFR clears all the register bits.
RSTSRC
Address:
Reset State:
1F92H
XXH
(1)
The reset source (RSTSRC) register indicates the source(s) of the last reset that the microcontroller
encountered.
7
0
CFDRST
WDTRST
SFWRST
EXTRST
Bit
Number
Bit
Mnemonic
Function
7:4
Reserved; for compatibility with future devices, write zeros to these bits.
3
CFDRST
Clock Failure Detection Reset
When set, this bit indicates that a failed clock caused the last reset.
2
WDTRST
Watchdog Timer Reset
When set, this bit indicates that the watchdog timer caused the last reset.
1
SFWRST
Software Reset
When set, this bit indicates that either the RST instruction or the IDLPD
instruction used with an illegal key caused the last reset.
0
EXTRST
External Reset
When set, this bit indicates that the RESET# pin being asserted caused the
last reset.
NOTE:
1.
The State of the RSTSRC register is inderterminate on a V
CC
power up condition. All other reset
states will have the corresponding reset event bit set in the register.
Figure 9-1. Reset Source (RSTSRC) Register
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