Interfacing to Microprocessors by J. C. Cluley (auth.)

By J. C. Cluley (auth.)

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The data chain register is used to enable the action of one channel working in burst mode to be followed immediately by the transfers programmed into channel 3 (also working in burst mode). The individual channel control registers provide the following functions DMA transfer end flag busy /ready flag decrement or increment address register, allowing the data block to be accessed from the top or the bottom whether TSC or Halt control is to be used Input/Output Packages 49 whether cycle-stealing or burst mode read/write to determine the direction of transfer.

8 Typical data block for 8251 USART The final character is a command instruction byte which can clear error flags, enable or disable interrupts, control RTS and reset the USART so that it returns to await a new mode byte. The MS bit at the receiving terminal is initially set at 1 to enter the hunt mode. This looks for a match between the incoming bit stream and the SYNC character already loaded. The receiving shift register is initially loaded with all 1 's. When one or two SYNC characters have been detected (depending on the MS bit of the mode byte), the SYNDET line is driven high.

The initial clear of DDRA and DDRB will program ports A and B both as inputs. Should for example port B be required to act as an output port, the contents of DDRB must be changed to eight 1's, or FF in hexadecimal. The simplest procedure for this is the complement instruction, that is Machine code 73 40 02 COM 4002 Note that this is 1's complement, not the arithmetic 2's complement, better called negate. If however, we require to set for example bits PBO-PB3 as inputs, and PB4-PB7 as outputs we must use an immediate load instruction.

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Interfacing to Microprocessors by J. C. Cluley (auth.)
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