12-1
CHAPTER 12
ONCE MODE
ONCE (pronounced “ahnce”) Mode provides the ability to three-state all output, bidirectional, or
weakly held high/low pins except OSCOUT. To allow device operation with a crystal network,
OSCOUT does not three-state.
ONCE Mode electrically isolates the device from the rest of the board logic. This isolation allows
a bed-of-nails tester to drive the device pins directly for more accurate and thorough testing. An
in-circuit emulation probe uses ONCE Mode to isolate a surface-mounted device from board log-
ic and essentially “take over” operation of the board (without removing the soldered device from
the board).
12.1 ENTERING/LEAVING ONCE MODE
Forcing UCS and LCS low while RES is asserted (low) enables ONCE Mode (see Figure 12-1).
Maintaining UCS and LCS and RES low continues to keep ONCE Mode active. Returning UCS
and LCS high exits ONCE Mode.
However, it is possible to keep ONCE Mode always active by deasserting RES while keeping
UCS and LCS low. Removing RES “latches” ONCE Mode and allows UCS and LCS to be driv-
en to any level. UCS and LCS must remain low for at least one clock beyond the time RES is
driven high. Asserting RES exits ONCE Mode, assuming UCS and LCS do not also remain low
(see Figure 12-1).
Содержание 80C186XL
Страница 1: ...80C186XL 80C188XL Microprocessor User s Manual...
Страница 2: ...80C186XL 80C188XL Microprocessor User s Manual 1995...
Страница 18: ...1 Introduction...
Страница 19: ......
Страница 27: ......
Страница 28: ...2 Overview of the 80C186 Family Architecture...
Страница 29: ......
Страница 79: ......
Страница 80: ...3 Bus Interface Unit...
Страница 81: ......
Страница 127: ......
Страница 128: ...4 Peripheral Control Block...
Страница 129: ......
Страница 137: ......
Страница 138: ...5 ClockGenerationand Power Management...
Страница 139: ......
Страница 154: ...6 Chip Select Unit...
Страница 155: ......
Страница 178: ...7 Refresh Control Unit...
Страница 179: ......
Страница 193: ......
Страница 194: ...8 Interrupt Control Unit...
Страница 195: ......
Страница 227: ......
Страница 228: ...9 Timer Counter Unit...
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Страница 253: ......
Страница 254: ...10 Direct Memory Access Unit...
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Страница 283: ......
Страница 284: ...11 Math Coprocessing...
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Страница 302: ...12 ONCE Mode...
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Страница 306: ...A 80C186 Instruction Set Additions and Extensions...
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Страница 318: ...B Input Synchronization...
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Страница 322: ...C Instruction Set Descriptions...
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Страница 371: ......
Страница 372: ...D Instruction Set Opcodes and Clock Cycles...
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Страница 396: ...Index...
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