e program uses the new instructions INS, OUTS and SHR, n. If the .186 directive is not
used, the message of ‘invalid instruction’ will be obtained.
14.3 | Block Diagram of the 80186
Figure 14.1 shows the internal block diagram of the 80186. e external pins are also seen in
the diagram. Since we have already discussed the features of 8086, our focus here will be to have
a quick at the components within the 80186, which are not present in 8086. We will discuss the
peripherals of this processor, which we have not encountered in the 8086.
DRQ0
DRQ1
Execution Unit
INT1
INT0
TMR OUT 1 TMR OUT 0
TMR IN
1
TMR IN
0
ALE
RESET
SRDY
ARDY ...
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