Table of Contents
Advertisement
S3C80A5B
BASIC TIMER AND TIMER 0
10
BASIC TIMER and TIMER 0
MODULE OVERVIEW
The S3C80A5B has two default timers: an 8-bit basic timer and one 8-bit general-purpose timer/counter. The 8-bit
timer/counter is called timer 0.
Basic Timer (BT)
You can use the basic timer (BT) in two different ways:
— As a watchdog timer to provide an automatic reset mechanism in the event of a system malfunction, or
— To signal the end of the required oscillation stabilization interval after a reset or a Stop mode release.
BASIC TIMER CONTROL REGISTER (BTCON)
The basic timer control register, BTCON, is used to select the input clock frequency, to clear the basic timer counter
and frequency dividers, and to enable or disable the watchdog timer function. It is located in set 1, address D3H, and
is read/write addressable using Register addressing mode.
A system reset clears BTCON. This enables the watchdog function and selects a basic timer clock frequency of
f
/4096. To disable the watchdog function, you must write the signature code '1010B' to the basic timer register
OSC
control bits BTCON.7–BTCON.4. For more reliability, we recommend to use the Watch-dog timer function in remote
controller and hand-held product application.
10-1
Advertisement
Table of Contents
