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Appendix D. 82C54 Counter Chip
Function
D.1 The Intel 82C54
The MIC-3716 uses one Intel 82C54 compatible programmable
interval timer/counter chip. The popular 82C54 offers three
independent 16-bit counters, counter 0, counter 1 and counter 2. Each
counter has a clock input, control gate and an output. You can
program each counter for maximum count values from 2 to 65535.
The 82C54 has a maximum input clock frequency of 10 MHz. The
MIC-3716 provides 10 MHz input frequencies to the counter chip
from an on-board crystal oscillator.
Counter 0
On the MIC-3716, counter 0 can be a 16-bit timer or an event counter,
selectable by users. When the clock source is set as an internal source,
counter 0 is a 16-bit timer; when set as an external source, then
counter 0 is an event counter and the clock source comes from
CNT0_CLK. The counter is controlled by CNT0_GATE. When
CNT0_GATE input is high, counter 0 will begin to count.
Counter 1 & 2
Counter 1 and counter 2 of the counter chip are cascaded to create a
Summary of Contents for MIC-3716
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Page 8: ...viii Table E 2 D A binary code table 117...
Page 11: ...1 Introduction 1 CHAPTER...
Page 17: ...7 Fig 1 1 Installation Flow Chart...
Page 21: ...11 Installation and Configuration CHAPTER 2...
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Page 41: ...31 Signal Connections CHAPTER 3...
Page 44: ...34 Fig 3 1 I O connector pin assignments for the MIC 3716...
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Page 55: ...45 Software Programming Overview CHAPTER 4...
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Page 61: ...51 Calibration CHAPTER 5...
Page 77: ...67 Appendixes...
Page 81: ...71 Appendix B Block Diagrams...
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