Samsung S3F80JB manual Basic Timer Control Register Btcon

BASIC TIMER and TIMER 0 S3F80JB

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 watch-dog timer function. It is located in Set 1 and Bank0, address D3H, and is read/write addressable using register addressing mode.

A reset clears BTCON to '00H'. This enables the watch-dog function and selects a basic timer clock frequency of fOSC/4096. To disable the watch-dog function, you must write the signature code '1010B' to the basic timer register control bits BTCON.7–BTCON.4. For improved reliability, using the watch-dog timer function is recommended in remote controllers and hand-held product applications.

Basic Timer Control Register (BTCON)

D3H, Set 1, Bank 0 , R/W

MSB	.7	.6	.5	.4	.3			.2	.1	.0	LSB
Watch-dog Timer Enable Bits:										Divider Clear Bit for BT and T0:
1010B = Disable watch-dog function										0 = No effect
Others = Enable watch-dog function										1 = Clear both dividers
									Basic Timer Counter Clear Bits:
									0 = No effect
									1 = Clear BTCNT
						Basic Timer Input Clock Selection Bits:
					00		= fOSC/4096
					01		= fOSC/1024
					10		= fOSC/128
					11		= Invalid selection

Figure 10-1. Basic Timer Control Register (BTCON)

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