IA186EB/IA188EB
Data Sheet
8-Bit/16-Bit Microcontrollers
July 10, 2011
4.
Functional Description
4.1
Device Architecture
Architecturally, the IA186EB and IA188EB microcontrollers include the following functional
modules:
Bus Interface Unit
Clock Generator
Interrupt Control Unit
Timer/Counter Unit
Serial Communications Unit
Chip-Select Unit
I/O Port Unit
Refresh Control Unit
Power Management Unit
A functional block diagram of the IA186EB/IA188EB is shown in Figure 10. Descriptions of
the functional modules are provided in the following subsections.
4.1.1 Bus Interface Unit
The IA186EB/IA188EB bus controller that generates local bus control signals and uses a
hold/hlda protocol to share the local bus with other bus masters. The bus controller generates
20 address bits, read and write control signals, and bus-cycle status information. A ready input is
used to extend a bus cycle beyond the minimum four clock cycles.
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