AM186ES Advanced Micro Devices, AM186ES Datasheet - Page 49

• Manufacturer Part Number: AM186ES
• Description: microcontrollers provide a low-cost/ high-performance solution for embedded system designers who wish to use the x86 architecture.
• Manufacturer: Advanced Micro Devices

SRDY/PIO6
TMRIN0/PIO11
TMRIN1/PIO0
TMROUT0/PIO10 Timer Output 0 (output, synchronous)
TMROUT1/PIO1
TXD0/PIO22
TXD1/PIO27
defaults to a PIO input with pullup, so the pin does not need to be driven
High externally.
Synchronous Ready (input, synchronous, level-sensitive)
This pin indicates to the microcontroller that the addressed memory
space or I/O device will complete a data transfer. The SRDY pin accepts
an active High input synchronized to CLKOUTA.
Using SRDY instead of ARDY allows a relaxed system timing because
of the elimination of the one-half clock period required to internally
synchronize ARDY. To always assert the ready condition to the
microcontroller, tie SRDY High. If the system does not use SRDY, tie
the pin Low to yield control to ARDY.
Timer Input 0 (input, synchronous, edge-sensitive)
This pin supplies a clock or control signal to the internal microcontroller
timer 0. After internally synchronizing a Low-to-High transition on
TMRIN0, the microcontroller increments the timer. TMRIN0 must be
tied High if not being used. When PIO11 is enabled, TMRIN0 is pulled
High internally.
TMRIN0 is driven internally by INT2/INTA0/PWD when pulse width
demodulation mode is enabled. The TMRIN0/PIO11 pin can be used
as a PIO when pulse width demodulation mode is enabled.
Timer Input 1 (input, synchronous, edge-sensitive)
This pin supplies a clock or control signal to the internal microcontroller
timer 1. After internally synchronizing a Low-to-High transition on
TMRIN1, the microcontroller increments the timer. TMRIN1 must be
tied High if not being used. When PIO0 is enabled, TMRIN1 is pulled
High internally.
TMRIN1 is driven internally by INT2/INTA0/PWD when pulse width
demodulation mode is enabled. The TMRIN1/PIO0 pin can be used as
a PIO when pulse width demodulation mode is enabled.
This pin supplies the system with either a single pulse or a continuous
waveform with a programmable duty cycle. TMROUT0 is floated during
a bus hold or reset.
Timer Output 1 (output, synchronous)
This pin supplies the system with either a single pulse or a continuous
waveform with a programmable duty cycle. TMROUT1 floats during a
bus hold or reset.
Transmit Data 0 (output, asynchronous)
This pin supplies asynchronous serial transmit data to the system from
serial port 0.
Transmit Data 1 (output, asynchronous)
This pin supplies asynchronous serial transmit data to the system from
serial port 1.
System Overview
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