Intel 8XC196NT User Manual page 502

AD_RESULT (Write)
The high byte of the A/D result (AD_RESULT) register can be written to set the reference voltage for
the A/D threshold-detection modes.
15
REFV7 REFV6
7
— —
Bit Bit
Number Mnemonic
15:8 REFV7:0
7:0 —
REFV5 REFV4
— —
Reference Voltage
These bits specify the threshold value. This selects a reference voltage
which is compared with an analog input pin. When the voltage on the
analog input pin crosses over (detect high) or under (detect low) the
threshold value, the A/D conversion complete interrupt pending bit is set.
Use the following formula to determine the value to write this register for
a given threshold voltage.
desired threshold voltage
---------------------------------------------------------------------------------- -
reference voltage =
Reserved; for compatibility with future devices, write zeros to these bits.
AD_RESULT (Write)
Reset State:
REFV3 REFV2
— —
Function
×
256
V ANG ND
–
REF
REGISTERS
Address: 1FAAH
7F80H
8
REFV1 REFV0
0
— —
C-7