Samsung Microphone S3C84E5 User Manual

10-1 

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. 

—  To signal the end of the required oscillation stabilization interval after a reset or a Stop mode release.  

The functional components of the basic timer block are: 

—  Clock frequency divider (fxx divided by 4096, 1024 or 128) with multiplexer 

—  8-bit basic timer counter, BTCNT (set 1, bank 0, FDH, read-only) 

—  Basic timer control register, BTCON (set 1, D3H, read/write) 

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 reset clears BTCON to '00H'. This enables the watchdog function and selects a basic timer clock frequency of 
fXX/4096. To disable the watchdog function, write the signature code '1010B' to the basic timer register control bits 
BTCON.7–BTCON.4. 

The 8-bit basic timer counter, BTCNT (set 1, bank 0, FDH), can be cleared at any time during normal operation by 
writing a "1" to BTCON.1. To clear the frequency dividers, write a "1" to BTCON.0.