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S3F80JB CONTROL REGISTERS
4-5
BTCON — Basic Timer Control Register D3H Set1 Bank0
Bit Identifier .7 .6 .5 .4 .3 .2 .1 .0
Reset Value
0 0 0 0 0 0 0 0
Read/Write
R/W R/W R/W R/W R/W R/W R/W R/W
Addressing Mode
Register addressing mode only
.7 – .4 Watchdog Timer Function Enable Bits (for System Reset)
1 0 1 0 Disable watchdog timer function
Any other value Enable watchdog timer function
.3 and .2 Basic Timer Input Clock Selection Bits
0 0
f
OSC
/4096
0 1
f
OSC
/1024
1 0
f
OSC
/128
1 1 Not used for S3F80JB.
.1
Basic Timer Counter Clear Bit
(1)
0 No effect
1 Clear the basic timer counter value
.0
Clock Frequency Divider Clear Bit for Basic Timer and Timer 0
(2)
0 No effect
1 Clear both block frequency dividers
NOTES:
1. When you write a “1” to BTCON.1, the basic timer counter value is cleared to ‘00H’. Immediately following the write
operation, the BTCON.1 value is automatically cleared to “0”.
2. When you write a "1" to BTCON.0, the corresponding frequency divider is cleared to '00H'. Immediately following the
write operation, the BTCON.0 value is automatically cleared to "0".