83C196MC Intel Corporation, 83C196MC Datasheet - Page 16

• Manufacturer Part Number: 83C196MC
• Description: INDUSTRIAL MOTOR CONTROL MICROCONTROLLER
• Manufacturer: Intel Corporation

8XC196MC
A TO D CHARACTERISTICS
The sample and conversion time of the A D convert-
er in the 8-bit or 10-bit modes is programmed by
loading a byte into the AD TIME Special Function
Register This allows optimizing the A D operation
for specific applications The AD TIME register is
functional for all possible values but the accuracy of
the A D converter is only guaranteed for the times
specificed in the operating conditions table
The value loaded into AD TIME bits 5 6 7 deter-
mines the sample time T
ing the following formula
SAM must be in the range 1 through 7
The value loaded into AD TIME bits 0 – 5 deter-
mines the conversion time T
using the following formula
16
T
F
SAM
SAM
OSC
CONV
e
e
e
bits 5 6 7
Value loaded into AD TIME
SAM
Sample time
Processor frequency MHz
e
(T
CONV c
e
(T
SAM c
SAM
2B
CONV
F
OSC
s
and is calculated us-
F
8
OSC
)
and is calculated
b
)
3
b
b
2
1
CONV must be in the range 2 through 31
The converter is ratiometric so absolute accuracy is
dependent on the accuracy and stability of V
V
resistor ladder and the analog portion of the convert-
er and input port pins There is also an AD TEST
SFR that allows for conversion on ANGND and
V
lute error listed is WITHOUT doing any adjustments
A D CONVERTER SPECIFICATION
The specifications given assume adherence to the
operating conditions section of this data sheet Test-
ing is performed with V
operating frequency After a conversion is started
the device is placed in the IDLE mode until the con-
version is complete
REF
REF
T
F
B
B
CONV
must be close to V
as well as adjusting the zero offset The abso-
CONV
OSC
e
e
8 for 8-bit conversion
10 for 10-bit conversion
e
e
e
Processor frequency MHz
bits 0 – 5
Value loaded into AD TIME
Conversion time
REF
CC
since it supplies both the
e
5 12V and 16 0 MHz
s
REF