Lenovo ThinkPad 560E TP 560Z Technical Reference Manual - Page 36

RT/CMOS Address and NMI Mask Register (X'0070'), RT/CMOS Data Register (X'0071'),

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RT/CMOS Address and NMI Mask Register (X'0070') The NMI mask register is used with the RT/CMOS data register (X'0071') to read from and write to the RT/CMOS RAM bytes. Attention The operation following a write to X'0070' should access X'0071'; otherwise, intermittent failures of the RT/CMOS RAM can occur. Bit Function 7 NMI mask 6-0 RT/CMOS RAM address Figure 2-13. RT/CMOS Address and NMI Mask Register (X'0070') Bit 7 Bits 6-0 When this write-only bit is set to 1, the NMI is masked (disabled). This bit is set to 1 by a power-on reset. These bits are used to select RT/CMOS RAM addresses. RT/CMOS Data Register (X'0071') The RT/CMOS data register is used with the RT/CMOS address and NMI mask register (X'0070') to read from and write to the RT/CMOS RAM bytes. Bit Function 7-0 RT/CMOS data Figure 2-14. RT/CMOS Data Register (X'0071') 2-18 ThinkPad 560Z System Board

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RT/CMOS Address and NMI Mask Register (X
'
0070
'
)
The NMI mask register is used with the RT/CMOS data register
(X
'
0071
'
) to read from and write to the RT/CMOS RAM bytes.
Attention
The operation following a write to X
'
0070
'
should access
X
'
0071
'
; otherwise, intermittent failures of the RT/CMOS RAM
can occur.
Figure
2-13.
RT/CMOS Address and NMI Mask Register (X
'
0070
'
)
Bit
Function
7
NMI mask
6–0
RT/CMOS RAM address
Bit 7
When this write-only bit is set to 1, the NMI is masked
(disabled).
This bit is set to 1 by a power-on reset.
Bits 6–0
These bits are used to select RT/CMOS RAM
addresses.
RT/CMOS Data Register (X
'
0071
'
)
The RT/CMOS data register is used with the RT/CMOS address and
NMI mask register (X
'
0070
'
) to read from and write to the
RT/CMOS RAM bytes.
Figure
2-14.
RT/CMOS Data Register (X
'
0071
'
)
Bit
Function
7–0
RT/CMOS data
2-18
ThinkPad 560Z System Board