6502 Applications Book by Rodnay Zaks PDF

By Rodnay Zaks

ISBN-10: 0895880156

ISBN-13: 9780895880154

E-book by way of Rodnay Zaks

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Sample text

Fig. 2-30: 6522 . Auxlllary Control Register Selects Timer 1 Operating Modes 44 THE INPUT OUTPUT CHIPS Loading the Counters Each timer uses a 16-bit counter. The low part must be loaded first and the high part must be loaded next. Loading the high part of the counter automatically clears the timer interrupt flag and starts the timer running. Timer 1 is also equipped with a true 16-bit latch, while Timer 2 is not. This enables Timer 1 to operate continuously, in "freerunning" mode; the latch is automatically transferred to the counter when the counter reaches zero.

Whenever 8 bits have been accumulated, the corresponding interrupt flag of IFR will be triggered. The program will deposit a value such as "0" in the SR, then test continuously the value of IFR bit 2. Whenever an interrupt is detected, the shift is complete. The shift register should then be disabled by zeroing bits 2, 3, 4 of ACR, while the program is storing data away. Naturally if data is coming in continuously, the shift register will not be disabled and the program should "come back" quickly enough not to lose data.

The contents of the interrupt flag register are shown in Fig 2-28. Bit position I of the IFR needs to be tested in order to determine whether the CAI "data ready" signal has been received. This is performed by the following three instructions: TEST LDA AND BEQ IFR #$2 TEST The AND instruction masks out all bits except bit position I so that it can be tested. As long as bit I is zero, this program will remain in this polling loop. Once the "data ready" signal has been recognized, data can be read from the ORA and transferred to their final memory location, which we will assume to be, as usual, memory location 20: LDA STA ORA $20 Reading the contents of ORA into the accumulator will also automatically clear bit I of IFR (the CAI status indicator), so that the internal interrupt will be automatically reset.

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6502 Applications Book by Rodnay Zaks

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