IA186XL/IA188XL
16-Bit Microcontrollers
Data Sheet
July 6, 2011
and dt/r_n) when interfacing to external transceiver chips. This capability allows the addition of
transceivers for simple buffering of the multiplexed address/data bus. During reset, the local bus
controller performs the following actions:
1. Floats ad0–15 (ad0–8), a16–19 (a9–a19), bhe_n (rfsh_n), dt/r_n
2. Drives ale LOW
3. Drives hlda LOW
4. Drives lock_n HIGH and then floats
5. Drives den_n, rd_n, and wr_n HIGH for one clock cycle, then floats them
6. Drives s0_n, s1_n and s2_n to the inactive state (all HIGH) and then floats them
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