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參數(shù)資料
| 型號： | PCSYSCON |
| 英文描述： | PC(ISA)BUS I/O CARD |
| 中文描述： | 電腦（ISA）總線的I / O卡 |
| 文件頁數(shù)： | 11/36頁 |
| 文件大?。?/td> | 383K |
| 代理商： | PCSYSCON |
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DAC Registers
The DAC registers (DAC+5, DAC+12, DAC-12 and DACTEMP) set
the levels at which an alarm can occur if the alarm mask registers
are set. For example, the +5V power line in the PC is compared with
the voltage produced by the DAC+5 digital-to-analogue converter
(DAC). If the +5V power line is below this voltage a bit is set in the
STATUS register. This can be read at any time. In addition, if the
BUZM alarm mask register is programmed to allow a power fail to
sound the buzzer then this will also sound.
Alarms from the three power-line monitors DAC+5, DAC+12 and
DAC- 12 are combined into one signal PFAIL for the alarm mask
registers. The over-temperature signal (from the DACTEMP register)
is a separate bit in the alarm mask registers.
It is possible to use the DACs as analogue-to-digital converters to
measure the power line voltages and temperature. To do this, simply
disable the PFAIL and OTEMP alarms and write to the DAC register
of interest, reading the corresponding bit in the STATUS register.
The value at which the bit flips corresponds to the voltage or
temperature.
To maintain reasonable accuracy, each DAC is scaled differently.
General-Purpose Digital I/O Registers
These registers are accessed at pointer value 4. Writing a byte to
pointer value 4 sets bits on the 50-way connector PL2, and reading
pointer value 4 reads bits on this connector. A high bit (=1)
corresponds to a high TTL level on the connector pins - there is no
inversion.
2192-09065-000-000
Section 2. The PCSYSCON I/O Map
Page 11
J278 PCSYSCON
Pointer
3
2
1
0
DACTEMP
DAC-12
DAC+12
DAC+5
Temperature high
-12V supply low
+12V supply low
+5V supply low
1 bit=0.482C
1 bit=-60.53mV
1 bit=60.73mV
1 bit=24.22mV
Name
Function
Scaling
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