Samsung S3F80JB - Manual (Page 108)

S3F80JB CONTROL REGISTERS
4-41
T0CON
— Timer 0 Control Register D2H Set 1 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 – .6 Timer 0 Input Clock Selection Bits
0 0 f
OSC
/4096
0 1 f
OSC
/256
1 0 f
OSC
/8
1 1 External clock input (at the T0CK pin, P3.1 or P3.2)
.5 and .4 Timer 0 Operating Mode Selection Bits
0 0 Interval timer mode (counter cleared by match signal)
0 1 Capture mode (rising edges, counter running, OVF interrupt can occur)
1 0 Capture mode (falling edges, counter running, OVF interrupt can occur)
1 1 PWM mode (Match and OVF interrupt can occur)
.3 Timer 0 Counter Clear Bit
0 No effect (when write)
1 Clear T0 counter, T0CNT (when write)
.2 Timer 0 Overflow Interrupt Enable Bit (note)
0 Disable T0 overflow interrupt
1 Enable T0 overflow interrupt
.1 Timer 0 Match/Capture Interrupt Enable Bit
0 Disable T0 match/capture interrupt
1 Enable T0 match/capture interrupt
.0 Timer 0 Match/Capture Interrupt Pending Flag Bit
0 No T0 match/capture interrupt pending (when read)
0 Clear T0 match/capture interrupt pending condition (when write)
1 T0 match/capture interrupt is pending (when read)
1 No effect (when write)
NOTE: A timer 0 overflow interrupt pending condition is automatically cleared by hardware. However, the timer 0
match/capture interrupt, IRQ0, vector FCH, must be cleared by the interrupt service routine (S/W).