s3c72m9 Samsung Semiconductor, Inc., s3c72m9 Datasheet - Page 345

• Manufacturer Part Number: s3c72m9
• Description: The S3c72m5/s3c72m7/s3c72m9 Single-chip Cmos Microcontroller Has Been Designed For High Performance Using Samsung S
• Manufacturer: Samsung Semiconductor, Inc.

S3C72M5/C72M7/C72M9/P72M9 (Preliminary Spec)
COMPARATOR
14
COMPARATOR
OVERVIEW
P4.0, P4.1 and P4.2 can be used as a analog input port for a comparator. The reference voltage for the 3-channel
comparator can be supplied either internally or externally at P4.2. When an internal reference voltage is used, three
channels (P4.0–P4.2) are used for analog inputs and the internal reference voltage is varied in 16 levels. If an
external reference voltage is input at P4.2, the other P4.0 and 4.1 pins are used for analog input.
When a conversion is completed, the result is saved in the comparison result register CMPREG. The initial values of
the CMPREG are undefined and the comparator operation is disabled by a RESET. The comparator module has the
following components:
— Comparator
— Internal reference voltage generator (4-bit resolution)
— External reference voltage source at P4.2
— Comparator mode register (CMOD)
— Comparison result register (CMPREG)
14-1