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GMS81C2112 Datasheet(PDF) 48 Page - Hynix Semiconductor |
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GMS81C2112 Datasheet(HTML) 48 Page - Hynix Semiconductor |
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48 / 107 page 
GMS81C2112/GMS81C2120 42 JUNE. 2001 Ver 1.00 12. TIMER/EVENT COUNTER The GMS81C21xx has two Timer/Counter registers. Each module can generate an interrupt to indicate that an event has occurred (i.e. timer match). Timer 0 and Timer 1 are can be used either two 8-bit Tim- er/Counter or one 16-bit Timer/Counter with combine them. In the "timer" function, the register is increased every in- ternal clock input. Thus, one can think of it as counting in- ternal clock input. Since a least clock consists of 2 and most clock consists of 2048 oscillator periods, the count rate is 1/2 to 1/2048 of the oscillator frequency in Timer0. And Timer1 can use the same clock source too. In addition, Timer1 has more fast clock source (1/1 to 1/8). In the “counter” function, the register is increased in re- sponse to a 1-to-0 (falling edge) or 0-to-1(rising edge) tran- sition at its corresponding external input pin, EC0. In addition the “capture” function, the register is increased in response external or internal clock sources same with timer or counter function. When external clock edge input, the count register is captured into capture data register CDRx. Timer1 is shared with "PWM" function and "Compare out- put" function It has seven operating modes: "8-bit timer/counter", "16- bit timer/counter", "8-bit capture", "16-bit capture", "8-bit compare output", "16-bit compare output" and "10-bit PWM" which are selected by bit in Timer mode register TM0 and TM1 as shown in Figure 12-1 and Table 12-1. 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 X 0 XXX 11 0 16-bit Capture (internal clock) 1 0 0 0 XXX 11 1 16-bit Compare Output Table 12-1 Operating Modes of Timer0 and Timer1 |
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