Samsung C8278X ユーザーズマニュアル

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 
f

xx

/4096. To disable the watchdog function, you must 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 for all timers input clock, you write a "1" to BTCON.0. 

Basic Timer Control Register (BTCON)

D3H, Set 1, R/W

.7

.6

.5

.4

.3

.2

.1

.0

MSB

LSB

Divider clear bit for all timers:
0 = No effect
1 = Clear divider

Basic timer counter clear bit:
0 = No effect
1 = Clear BTCNT

Basic timer input clock selection bits:
00 = f

XX

/4096

01 = f

XX

/1024

10 = f

XX

/128

11 = f

XX

/16

Watchdog function enable bits:
1010B
Other values

= Disable watchdog timer
= Enable watchdog timer