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80C32-12 Datasheet(PDF) 7 Page - TEMIC Semiconductors |
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80C32-12 Datasheet(HTML) 7 Page - TEMIC Semiconductors |
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7 / 20 page  80C32/80C52 Rev. G (14 Jan. 97) 7 MATRA MHS When the port latch contains a 0, all pFETS in figure 4 are off while the nFET is turned on. When the port latch makes a 0-to-1 transition, the nFET turns off. The strong pFET, T1, turns on for two oscillator periods, pulling the output high very rapidly. As the output line is drawn high, pFET T3 turns on through the inverter to supply the IOH source current. This inverter and T form a latch which holds the 1 and is supported by T2. When Port 2 is used as an address port, for access to external program of data memory, any address bit that contains a 1 will have his strong pullup turned on for the entire duration of the external memory access. When an I/O pin on Ports 1, 2, or 3 is used as an input, the user should be aware that the external circuit must sink current during the logical 1-to-0 transition. The maximum sink current is specified as ITL under the D.C. Specifications. When the input goes below approximately 2 V, T3 turns off to save ICC current. Note, when returning to a logical 1, T2 is the only internal pullup that is on. This will result in a slow rise time if the user’s circuit does not force the input line high. Oscillator Characteristics XTAL1 and XTAL2 are the input and output respectively, of an inverting amplifier which is configured for use as an on-chip oscillator, as shown in figure 5. Either a quartz crystal or ceramic resonator may be used. Figure 5. Crystal Oscillator. To drive the device from an external clock source, XTAL1 should be driven while XTAL2 is left unconnected as shown in figure 6. There are no requirements on the duty cycle of the external clock signal, since the input to the internal clocking circuitry is through a divide-by-two flip-flop, but minimum and maximum high and low times specified on the Data Sheet must be observed. Figure 6. External Drive Configuration. Hardware Description Same as for the 80C51, plus a third timer/counter : Timer/Event Counter 2 Timer 2 is a 16 bit timer/counter like Timers 0 and 1, it can operate either as a timer or as an event counter. This is selected by bit C/T2 in the Special Function Register T2CON (Figure 1). It has three operating modes : “capture”, “autoload” and “baud rate generator”, which are selected by bits in T2CON as shown in Table 2. In the capture mode there are two options which are selected by bit EXEN2 in T2CON; If EXEN2 = 0, then Timer 2 is a 16 bit timer or counter which upon overflowing sets bit TF2, the Timer 2 overflow bit, which can be used to generate an interrupt. If EXEN2 = 1, then Timer 2 still does the above, but with the added feature that a 1-to-0 transition at external input T2EX causes the current value in the Timer 2 registers, TL2 and TH2, to be captured into registers RCAP2L and RCAP2H, respectively, (RCAP2L and RCAP2H are new Special Function Register in the 80C52). In addition, the transition at T2EX causes bit EXF2 in T2CON to be set, and EXF2, like TF2, can generate an interrupt. Table 2. Timer 2 Operating Modes. RCLK + TCLK CP/RL2 TR2 MODE 0 0 1 X 0 1 X X 1 1 1 0 16 bit auto-reload 16 bit capture baud rate generator (off) |
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Similar Description - 80C32-12 |
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