Oki Dr.63514, User Manual, Page: 55 / 101

Chapter 2. Functions
2-34
2.7.2 Sync Out Signal
For each code memory address, the emulator provides a sync out bit that controls this output.
If a bit is “1,” execution of the instruction at the corresponding address pulls the probe cable sync out
(SYNC.OUT) output to “L” level for the first half of an instruction S1 cycle.
0000H
0001H
0002H
0003H
0004H
0FFFDH
0FFFEH
0FFFFH
Sync out bits
Addresses specified by the
program counter (PC).
Latch
VDD
SYNC.OUT
(Probe cable)
Level
conversion
Code memory
Figure 2-13 Sync Out Bits
A built-in voltage conversion circuit converts the sync out (SYNC.OUT) signal “H” level to VDD, the
positive power supply voltage (0.9 to 5.5 V), for output.
n
Note 1
n
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Only the sync out bit specifications corresponding to the first word of an instruction produce
results. One specifying the second word of a two-word instruction or an entry in the ROM table
is ignored.
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