GLOSSARY

sample time

The period of time that the sample window is open.

 

(That is, the length of time that the input channel is

 

actually connected to the sample capacitor.)

sample time uncertainty

The variation in the sample time.

sample window

The period of time that begins when the sample

 

capacitor is attached to a selected channel of an A/D

 

converter and ends when the sample capacitor is

 

disconnected from the selected channel.

sampled inputs

All input pins, with the exception of RESET#, are

 

sampled inputs. The input pin is sampled one state

 

time before the read buffer is enabled. Sampling

 

occurs during PH1 (while CLKOUT is low) and

 

resolves the value (high or low) of the pin before it is

 

presented to the internal bus. If the pin value changes

 

during the sample time, the new value may or may not

 

be recorded during the read.

 

RESET# is a level-sensitive input. EXTINT is

 

normally a sampled input; however, the powerdown

 

circuitry uses EXTINT as a level-sensitive input

 

during powerdown mode.

SAR

Successive approximation register. A component of

 

the A/D converter.

set

The “1” value of a bit or the act of giving it a “1”

 

value. See also clear.

SFR

Special-function register.

SHORT-INTEGER

An 8-bit, signed variable with values from –2 7

 

through +27–1.

sign extension

A method for converting data to a larger format by

 

filling the upper bit positions with the value of the

 

sign. This conversion preserves the positive or

 

negative value of signed integers.

sink current

Current flowing into a device to ground. Always a

 

positive value.

source current

Current flowing out of a device from VCC. Always a

 

negative value.

SP

Stack pointer.

Glossary-9

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Intel 8XC196MC, 8XC196MD, 8XC196MH manual Sfr