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ST486DX bảng dữ liệu(PDF) 8 Page - STMicroelectronics

tên linh kiện ST486DX
Giải thích chi tiết về linh kiện  PROGRAMMING MANUAL
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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HALT
Suspend on HALT.
HALT = 0:
CPU does not enter suspend mode following execution of a HLT instruction
HALT = 1:
CPU enters suspend mode following execution of a HLT instruction.
SUSP
Enable Suspend Pins.
SUSP = 0:
SUSP# input is ignored and SUSPA# output floats.
SUSP = 1:
SUSP# input and SUSPA# output are enabled.
Reg. INDEX = C2h
7
654
3
2
1
0
SUSP
BWRT
BARB
WT1
HALT
LOCK-NW
WBAK
COP/Reserved
Table 2 - 2
CCR2
Reg. INDEX = C3h
7
654
3
2
1
0
NMIEN
SMI-LOCK
Reserved
Table 2 - 1
CCR3
ST486DX - SMM IMPLEMENTATION
16
SMI_LOCK SMM Register Lock.
SMI_LOCK = 0: Any program in normal mode, as well as SMM software, has access to all
Configuration Control Registers.
SMI_LOCK = 1: The following Configuration Control Register bits can not be modified unless
operating in SMM mode:
SMI, SMAC, MMAC, NMIEN, SMI_LOCK, and SMAR register size fields.
NMIEN
NMI Enable.
NMIEN = 0:
NMI (Non-Maskable Interrupt) is not recognized during SMM. One occurrence of
NMI is latched and serviced after SMM mode is exited. The NMIEN bit should
be cleared before executing a RSM instruction to exit SMM.
NMIEN = 1:
NMI is enabled during SMM. This bit should only be set temporarily while in the
SMM routine to allow NMI interrupts to be serviced. NMIEN should not be set


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