IA186ER/IA188ER
Data Sheet
16-Bit/8-Bit Microcontrollers with RAM
February 25, 2013
4.26 Internal Memory
Integrated 32 Kbyte of internal RAM provides the same performance as zero wait state external
memory. This memory is configured with an internal chip select register.
5.
Peripheral Architecture
5.1
Control and Registers
The on-chip peripherals in the IA186ER/IA188ER are controlled from a 256-byte block of
internal registers. Although these registers are actually located in the peripherals they control,
they are addressed within a single 256-byte block of I/O space and are treated as a functional
unit. A list of these registers is presented in Table 16.
Write operations performed on the IA188ER should be 8-bit writes, resulting in 16-bit data
transfers to the Peripheral Control Block (PCB) register. Only word reads should be performed
to the PCB registers. If unaligned read and write accesses are performed on either the IA186ER
or IA188ER, indeterminate behavior may result.
Note: Adhere to these instructions while writing code to avoid errors.
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