ELANSC310 datasheet(34/119 Pages) AMD

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Élan™SC310 Microcontroller Data Sheet

PREL IMINARY

DTR/CFG1

Data Terminal Ready (Output; Active Low)

This signal indicates to the external serial device that

the internal serial port controller is ready to communi-

cate.

The state of this signal is used to determine the pin

configuration at power-up. For more information, see

“Alternate Pin Functions” on page 59.

RIN

Ring Indicate (Input; Active Low)

This signal is used as a modem control function. A

change in state on this signal by the external serial de-

vice causes a modem status interrupt. This signal can

be used to cause the ÉlanSC310 microcontroller to re-

sume from a suspended state.

RTS

/CFG0

Request To Send (Output; Active Low)

This signal indicates to the external serial device that

the internal serial port controller is ready to send data.

The state of this signal is used to determine the pin

configuration at power-up. For more information, see

“Alternate Pin Functions” on page 59.

SIN

Serial Data In (Input; Active High)

This signal is used to receive the serial data from the

external serial device into the internal serial port

controller.

SOUT

Serial Data Out (Output; Active High)

This signal is used to transmit the serial data from the

internal serial port controller to the external serial

device.

POWER MANAGEMENT INTERFACE

ACIN

AC Input Status (Input; Active High)

When asserted, this signal disables all power manage-

ment functions (if so enabled). It can be used to indi-

cate when the system is being supplied power from an

AC source.

BL4–BL1

Battery Low Detects

(Inputs; Negative Edge Sensitive)

These signals are used to indicate to the ÉlanSC310

microcontroller the current status of the battery. BL4–

BL1 can indicate various conditions of the battery as

status changes. A High indicates normal operating

conditions, while a Low indicates a low voltage warning

condition. These inputs can be used to force the sys-

tem into one of the power saving modes when acti-

vated, as follows:

n BL1 can be programmed to force the system to go

to Low Speed PLL mode or to generate an SMI.

n BL2 can be programmed to force the system to

enter Sleep mode if not already in Sleep mode, or

to generate an SMI.

n BL3 can only be programmed to generate an SMI.

n BL4 can be programmed to force the system to

enter Suspend mode.

EXTSMI

External System Management Interrupt

(Input; Edge Sensitive)

This input is provided to allow external logic to gener-

ate an SMI request to the CPU. It is edge triggered,

with the polarity programmable.

LPH

Latched Power Control (Output; Active Low)

This signal is the inverse of BL4 if ACIN is not true and

BL4 is enabled.

PGP3–PGP0

Programmable Chip Select Generation

(Input/Output)

PGP0 and PGP1 can be programmed as input or out-

put. The default is input. PGP2 and PGP3 are output

only.

These general purpose pins can be individually pro-

grammed as decoder outputs or chip selects for other

external peripheral devices.

PGP0 and PGP2 can be gated with I/O write or act as

an address decode only. PGP1 and PGP3 can be

gated with I/O Read or act as an address decode only.

PGP0 and PGP1 can be directly controlled via a single

also be configured for a specific state when the PMU is

in the off state.

PGP2 and PGP3 can be programmed to be set to a

pre-defined state for Micro Power Off mode.

For more information about PGP3–PGP0, see the

ÉlanTMSC310 Microcontroller Programmer’s Refer-

ence Manual, order #20665 and Using 10-Bit ROMCS

Designs in ÉlanTMSC300 and ÉlanSC310 Microcontrol-

lers Application Note, order #21825.

PMC4–PMC0

Power Management Controls

(Output; Programmable)

The Power Management Control outputs control the

power to various external devices and system compo-

nents. The PMC0, PMC1, PMC2, and PMC4 signals

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