AMD Am186TMER ユーザーズマニュアル

The Am186ER and Am188ER microcontrollers are part of the AMD E86 family of embedded 
microcontrollers and microprocessors based on the x86 architecture. The 16-bit members of the 
E86 family, referred to throughout this manual as the Am186 and Am188 family, include the 
80C186, 80C188, 80L186, 80L188, Am186ER, Am188ER, Am186EM, Am188EM, 
Am186EMLV, Am188EMLV, Am186ES, Am188ES, Am186ESLV, Am188ESLV, 
Am186ED and Am186EDLV microcontrollers.

The Am186ER and Am188ER microcontrollers are designed to meet the most common 
requirements of embedded products developed for the office automation, mass storage, 
communications, and general embedded markets. Applications include disk drive 
controllers, hand-held and desktop terminals, fax machines, printers, photocopiers, feature 
phones, cellular phones, PBXs, multiplexers, modems, and industrial control.

A block diagram of each microcontroller is shown in Figure 1-1 and Figure 1-2. The 
Am186ER microcontroller uses a 16-bit external bus, while the Am188ER microcontroller 
has an 8-bit external bus.

The Am186ER and Am188ER microcontrollers provide the following features:

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Memory Integration:

– 32 Kbyte of internal RAM with an internal chip select register

– Internal RAM provides same performance as zero-wait-state external memory

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Reduced power consumption:

– 3.3-V ± 0.3-V operation at all operating frequencies

– I/O drivers tolerate 5-V signals

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High performance:

– 20-, 25-, 33-, and 40-MHz operating frequencies

– Support for zero-wait-state operation at 40 MHz with 70-ns memory

– 1-Mbyte memory address space and 64-Kbyte I/O space

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New features remove the requirement for a 2x clock input and provide faster access to 
memory:

– Phase-locked loop (PLL) allows processor to operate at up to four times the clock 

input frequency

– Nonmultiplexed address bus

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New integrated peripherals increase functionality while reducing system cost:

– 32 programmable I/O (PIO) pins

– Asynchronous serial port allows full-duplex, 7-bit or 8-bit data transfers

– Synchronous serial interface allows high-speed, half-duplex, bidirectional data 

transfer to and from application-specific integrated circuits (ASICs)

– Controller for external pseudo-static RAM (PSRAM) with auto refresh capability 

– Reset Configuration Register

– Additional external and internal interrupts

– Timer 1 can be configured to provide a watchdog timer interrupt