AM186 datasheet(56/112 Pages) AMD

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Am186TMER and Am188TMER Microcontrollers Data Sheet

DRAF

Figure 13. DMA Unit Block Diagram

ASYNCHRONOUS SERIAL PORT

The Am186ER and Am188ER microcontrollers provide

an asynchronous serial port. The asynchronous serial

port is a two-pin interface that permits full-duplex bidi-

rectional data transfer. The asynchronous serial port

supports the following features:

n Full-duplex operation

n 7-bit or 8-bit data transfers

n Odd, even, or no parity

n 1 or 2 stop bits

If additional RS-232 signals are required, they can be

created with available PIO pins. The asynchronous se-

rial port transmit and receive sections are double buff-

ered. Break character, framing, parity, and overrun

error detection are provided. Exception interrupt gener-

ation is programmable by the user.

The transmit/receive clock is based on the internal pro-

cessor clock, which is divided down internally to the se-

rial port operating frequency. The serial port permits 7-

bit and 8-bit data transfers. DMA transfers using the se-

rial port are supported.

The serial port generates one interrupt for any of three

serial port events—transmit complete, data received,

and receive error.

The serial port can be used in power-save mode, but

the software must adjust the transfer rate to correctly

reflect the new internal operating frequency and must

ensure that the serial port does not receive any infor-

mation while the frequency is being changed.

DMA Transfers through the Serial Port

The DMA channels can be directly connected to the

asynchronous serial port. DMA and serial port transfer

is accomplished by programming the DMA controller to

perform transfers between a memory or I/O space and

a serial port transmit or receive register. For more infor-

mation see the DMA control register descriptions in the

Am186ER and Am188ER Microcontrollers User’s Man-

ual, order #21684.

SYNCHRONOUS SERIAL INTERFACE

The synchronous serial interface (SSI) enables the

Am186ER and Am188ER microcontrollers to communi-

cate with application-specific integrated circuits (ASICs)

that require reprogrammability but are short on pins.

This four-pin interface permits half-duplex, bidirectional

data transfer at speeds of up to 25 Mbit/s.

Unlike the asynchronous serial port, the SSI operates

in a master/slave configuration. The Am186ER and

Am188ER microcontrollers are the master ports.

The SSI interface provides four pins for communicating

with system components: two enables (SDEN0 and

SDEN1), a clock (SCLK), and a data pin (SDATA). Five

20-bit Adder/Subtractor

DMA

Control

Logic

Request

Selection

Logic

Adder Control

Logic

Channel Control Register 1

Channel Control Register 0

DRQ1/Serial Port

DRQ0/Serial Port

Timer Request

Interrupt

Request

Transfer Counter Ch. 1

Destination Address Ch. 1

Destination Address Ch. 0

Transfer Counter Ch. 0

Source Address Ch. 1

Source Address Ch. 0

Internal Address/Data Bus

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