s3c72m9 Samsung Semiconductor, Inc., s3c72m9 Datasheet - Page 258

• 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.

TIMERS and TIMER/COUNTERS
8-BIT TIMER/COUNTER 0 (TC0)
OVERVIEW
Timer/counter 0 (TC0) is used to count system 'events' by identifying the transition (high-to-low or low-to-high) of
incoming square wave signals. To indicate that an event has occurred, or that a specified time interval has elapsed,
TC0 generates an interrupt request. By counting signal transitions and comparing the current counter value with the
reference register value, TC0 can be used to measure specific time intervals.
TC0 has a reloadable counter that consists of two parts: an 8-bit reference register (TREF0) into which you write the
counter reference value, and an 8-bit counter register (TCNT0) whose value is automatically incremented by counter
logic.
An 8-bit mode register, TMOD0, is used to activate the timer/counter and to select the basic clock frequency to be
used for timer/counter operations. To dynamically modify the basic frequency, new values can be loaded into the
TMOD0 register during program execution.
TC0 FUNCTION SUMMARY
8-bit programmable timer
External event counter
Arbitrary frequency output
External signal divider
11-10
Generates interrupts at specific time intervals based on the selected clock
frequency.
Counts various system "events" based on edge detection of external clock
signals at the TC0 input pin, TCL0. To start the event counting operation,
TMOD0.2 is set to "1" and TMOD0.6 is cleared to "0".
Outputs selectable clock frequencies to the TC0 output pin, TCLO0.
Divides the frequency of an incoming external clock signal according to a
modifiable reference value (TREF0), and outputs the modified frequency to the
TCLO0 pin.
S3C72M5/C72M7/C72M9/P72M9 (Preliminary Spec)