Samsung S3F80JB - Manual (Page 109)

CONTROL REGISTERS S3F80JB
4-42
T1CON
— Timer 1 Control Register FAH 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 and .6 Timer 1 Input Clock Selection Bits
0 0 f
OSC
/4
0 1 f
OSC
/8
1 0 f
OSC
/16
1 1 Internal clock (counter A flip-flop, T-FF)
.5 and .4 Timer 1 Operating Mode Selection Bits
0 0 Interval timer mode (counter cleared by match signal)
0 1 Capture mode (rising edges, counter running, OVF can occur)
1 0 Capture mode (falling edges, counter running, OVF can occur)
1 1 Capture mode (rising and falling edges, counter running, OVF can occur)
.3 Timer 1 Counter Clear Bit
0 No effect (when write)
1 Clear T1 counter, T1CNT (when write)
.2 Timer 1 Overflow Interrupt Enable Bit (note)
0 Disable T1 overflow interrupt
1 Enable T1 overflow interrupt
.1 Timer 1 Match/Capture Interrupt Enable Bit
0 Disable T1 match/capture interrupt
1 Enable T1 match/capture interrupt
.0 Timer 1 Match/Capture Interrupt Pending Flag Bit
0 No T1 match/capture interrupt pending (when read)
0 Clear T1 match/capture interrupt pending condition (when write)
1 T1 match/capture interrupt is pending (when read)
1 No effect (when write)
NOTE: A timer 1 overflow interrupt pending condition is automatically cleared by hardware. However, the timer 1 match/
capture interrupt, IRQ1, vector F6H, must be cleared by the interrupt service routine (S/W).