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HMS87C1204A Datasheet(PDF) 44 Page - Hynix Semiconductor |
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HMS87C1204A Datasheet(HTML) 44 Page - Hynix Semiconductor |
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44 / 88 page  HMS87C130XA/120XA/110XA Apr. 2001 ver1.0 41 12. TIMER / COUNTER The HMS87C1X0XA 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 can be used either two 8-bit Timer/ Counter or the one 16-bit Timer/Counter by combining 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 0-to-1 (rising edge) transition at its correspond- ing external input pin, EC0(Timer 0). Note: If changing the Timer value or starting again, it should be stop the timer clock firstly, and then set Timer register value. Ex) LDM TM0,#00001100B LDM TDR,#7FH LDM TM0,#00010111B In addition the “capture” function, the register is increased in response external interrupt same with timer function. When external interrupt edge input, the count register is captured into capture data register CDRx. Timer1 is shared with “PWM” function and “Compare output” 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 TMx as shown in Figure 12-1 and Table 12-1. Figure 12-1 Timer Mode Register (TM0, TM1) Timer 0 Mode Register TM0 ADDRESS : D0H RESET VALUE : --000000 - - CAP0 T0CK2 T0CK1 T0CK0 T0CN T0ST Timer 1 Mode Register TM1 ADDRESS : D2H RESET VALUE : 00000000 POL 16BIT PWM0E CAP1 T1CK1 T1CK0 T1CN T1ST CAP0 Capture mode selection bit. 0 : Disables Capture 1 : Enables Capture T0CN Continue control bit 0 : Stop counting 1 : Start counting continuously T0CK[2:0] Input clock selection 000 : fXIN ÷ 2, 100 : f XIN ÷ 128 001 : fXIN ÷ 4, 101 : f XIN ÷ 512 010 : fXIN ÷ 8, 110 : f XIN ÷ 2048 011 : fXIN ÷ 32, 111 : External Event ( EC0 ) T0ST Start control bit 0 : Stop counting 1 : Start counting POL PWM Output Polarity 0 : Duty active low 1 : Duty active high T1CK[2:0] Input clock selection 00 : fXIN 10 : fXIN ÷ 8 01 : fXIN ÷ 2 11 : using the Timer 0 clock 16BIT 16-bit mode selection 0 : 8-bit mode 1 : 16-bit mode T1CN Continue control bit 0 : Stop counting 1 : Start counting continuously PWM0E PWM enable bit 0 : Disables PWM 1 : Enables PWM T1ST Start control bit 0 : Stop counting 1 : Start counting CAP1 Capture mode selection bit. 0 : Disables Capture 1 : Enables Capture |
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