参数资料
型号: ST5x86
厂商: 意法半导体
英文描述: 100 and 120 MHz 3.45 Volt 5x86 CPU(微处理器)
中文描述: 100和120兆赫3.45伏特5x86的CPU(微处理器)
文件页数: 7/39页
文件大小: 326K
代理商: ST5X86
ST5x86
7/39
Figure 1.3. Configuration Control Register 1 (CCR1)
Table 1.3. CCR1 Bit Definitions
BIT
POSITION
NAME
DESCRIPTION
1*
USE_SMI
Enable SMM Pins
If = 1: SMI# input/output pin and SMADS# output pin are enabled.
If = 0: SMI# input pin ignored and SMADS# output pin floats.
2*
SMAC
System Management Memory Access
If = 1: Any access to addresses within the SMM memory space cause external bus
cycles to be issued with SMADS# output active. SMI# input is ignored.
If = 0: No effect on access.
3*
MMAC
Main Memory Access
If = 1: All data accesses which occur within an SMI service routine (or when SMAC = 1)
access main memory instead of SMM memory space.
If = 0: No effect on access.
Note:
Bits 0, 4-7 are reserved. Bits1-3 are cleared to 0 at reset.
*Note:
Access enabled by CCR3, bit 0, SMI-Lock bit.
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