Timer/Event Counter - Abov MC80F0304 User Manual

MC80F0304/08/16

13. TIMER/EVENT COUNTER

Each module can generate an interrupt to indicate that an event The MC80F0304/0308/0316 has Four Timer/Counter registers. counter function. When external clock edge input, the count reg- ister is captured into Timer data register correspondingly. When
has occurred (i.e. timer match). external clock edge input, the count register is captured into cap-
Timer 0 and Timer 1 are can be used either two 8-bit Timer/ ture data register CDRx.
Counter or one 16-bit Timer/Counter with combine them. Also Timer 0 and Timer 1 is shared with "PWM" function and "Com-
Timer 2 and Timer 3 are same. Timer 4 is 16-bit Timer/Counter. pare output" function. It has six operating modes: "8-bit timer/ counter", "16-bit timer/counter", "8-bit capture", "16-bit cap-
In the "timer" function, the register is increased every internal clock input. Thus, one can think of it as counting internal clock ture", "8-bit compare output", and "10-bit PWM" which are se-
input. Since a least clock consists of 2 and most clock consists of lected by bit in Timer mode register TM0 and TM1 as shown in
2048 oscillator periods, the count rate is 1/2 to 1/2048 of the os- Table 13-1, Figure 13-1 .
cillator frequency. pare output" function. It has six operating modes: "8-bit timer/ Timer 2 and Timer 3 is shared with "PWM" function and "Com-
In the "counter" function, the register is increased in response to a 0-to-1 (rising edge) transition at its corresponding external input counter", "16-bit timer/counter", "8-bit capture", "16-bit cap-
pin, EC0 or EC1. ture", "8-bit compare output", and "10-bit PWM" which are se-
In addition the "capture" function, the register is increased in re- Table 13-2, Figure 13-2 . lected by bit in Timer mode register TM2 and TM3 as shown in
sponse external or internal clock sources same with timer or
16BIT CAP0 CAP1 PWM1E T0CK [2:0] T1CK [1:0] PWM1O TIMER 0 TIMER 1
0 0 0 0 XXX XX 0 8-bit Timer 8-bit Timer
0 0 1 0 111 XX 0 8-bit Event counter 8-bit Capture
0 1 0 0 XXX XX 1 8-bit Capture (internal clock) 8-bit Compare Output
0 X 0 1 XXX XX 1 8-bit Timer/Counter 10-bit PWM
1 0 0 0 XXX 11 0 16-bit Timer
1 0 0 0 111 11 0 16-bit Event counter
1 1 1 0 XXX 11 0 16-bit Capture (internal clock)
Table 13-1 Operation Modes of Timer 0, 1
1. X means the value of "0" or "1" corresponds to user operation.
16BIT CAP2 CAP3 PWM3E T2CK [2:0] T3CK [1:0] PWM3O TIMER 2 TIMER 3
0 0 0 0 XXX XX 0 8-bit Timer 8-bit Timer
0 0 1 0 111 XX 0 8-bit Event counter 8-bit Capture
0 1 0 0 XXX XX 1 8-bit Capture (internal clock) 8-bit Compare Output
0 X 0 1 XXX XX 1 8-bit Timer/Counter 10-bit PWM
1 0 0 0 XXX 11 0 16-bit Timer
1 0 0 0 111 11 0 16-bit Event counter
1 1 1 0 XXX 11 0 16-bit Capture (internal clock)
Table 13-2 Operating Modes of Timer 2, 3
58 November 4, 2011 Ver 2.12