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S3F80JB
BTCON
— Basic Timer Control Register
Bit Identifier
Reset Value
Read/Write
Addressing Mode
.7 – .4
.3 and .2
.1
.0
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".
.7
.6
0
0
R/W
R/W
Register addressing mode only
Watchdog Timer Function Enable Bits (for System Reset)
1
0
1
0
Disable watchdog timer function
Any other value
Enable watchdog timer function
Basic Timer Input Clock Selection Bits
f
/4096
0
0
OSC
f
/1024
0
1
OSC
f
/128
1
0
OSC
1
1
Not used for S3F80JB.
Basic Timer Counter Clear Bit
0
No effect
1
Clear the basic timer counter value
Clock Frequency Divider Clear Bit for Basic Timer and Timer 0
0
No effect
1
Clear both block frequency dividers
.5
.4
.3
0
0
R/W
R/W
R/W
(1)
CONTROL REGISTERS
D3H Set1
.2
.1
0
0
0
R/W
R/W
(2)
Bank0
.0
0
R/W
4-5
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