ELANSC310 datasheet(50/119 Pages) AMD

50 / 119 page

Élan™SC310 Microcontroller Data Sheet

PREL IMINARY

PGP Pins

PGP2 and PGP3 can be programmed to be set to a

pre-defined state for Micro Power Off mode. For more

information, see the

ÉlanTMSC310 Microcontroller Pro-

grammer’s Reference Manual, order # 20665.

Micro Power Off Mode Implementation

The system should not be powered up directly into

Micro Power Off mode. The system must be allowed to

fully power up into High Speed mode upon initial power

application of any power source. If a battery has insuf-

ficient power for the ÉlanSC310 microcontroller to ini-

tialize into High Speed mode, the system design must

first power up the ÉlanSC310 microcontroller from the

main source, and not allow the chip to be powered from

the battery until after it is fully initialized in High Speed

mode and properly transitioned into Micro Power Off

mode.

This requirement presents an issue when using (for ex-

ample) a 3 V Lithium battery cell as a back-up power

source to prevent the RTC from losing its contents dur-

ing Micro Power Off mode. If the battery is installed be-

fo re any othe r power sour ce is available, the

requirement cannot be met because such a small bat-

tery is incapable of supplying sufficient power to fully

initialize the system. The ÉlanSC310 microcontroller

comes up in an undefined state, perhaps drawing suf-

ficient current to drain the battery.

The ÉlanSC310 microcontroller backup power source

should be installed only after the system is powered by

the main power source prior to a transition into Micro

Power Off mode. When the system has transitioned

into Micro Power Off mode properly, the simultaneous

benefits of low power consumption while maintaining

RTC data such as time, date, and system configuration

can be realized.

Note: The timing sequence and specifications for

power-up, entering, and exiting Micro Power Off mode

must be met. The timing information begins on

page 88.

For more information about Micro Power Off mode im-

plementation, see the ÉlanTMSC300 and ÉlanTMSC310

Microcontrollers Solution For Systems Using a Back-

up Battery Application Note

, order #20746 and the

Troubleshooting Guide for Micro Power Off Mode on

ÉlanTMSC300 and ÉlanSC310 Microcontrollers and

Evaluation Boards Application Note

, order #21810.

Core Peripheral Controllers

The ÉlanSC310 microcontroller includes all the stan-

dard peripheral controllers that make up a PC/AT sys-

tem, including interrupt controller, DMA controller,

counter/timer, and ISA bus controller. For more infor-

mation, see Chapter 3 of the

ÉlanTMSC310 Microcon-

troller Programmer’s Reference Manual, order #20665.

Interrupt Controller

The ÉlanSC310 microcontroller interrupt controller is

functionally compatible with the standard cascaded

8259A controller pair as implemented in the PC/AT.

The interrupt controller block accepts requests from

peripherals, resolves priority on pending interrupts and

interrupts in service, issues an interrupt request to the

processor, and provides the interrupt vector to the

processor.

The two devices are internally connected and must be

programmed to operate in Cascade mode for operation

of all 15 interrupt channels. Interrupt controller 1 occu-

pies I/O addresses 020h–021h and is configured for

master operation in Cascade mode. Interrupt controller

2 occupies I/O addresses 0A0h–0A1h and is config-

ured for slave operation. Channel 2 (IRQ2) of interrupt

controller 1 is used for cascading and is not available

externally.

The output of Timer 0 in the counter/timer section is

connected to Channel 0 (IRQ0) of Interrupt controller 1.

IRQ0 can be programmed to generate an SMI. See

Chapter 1 of the

ÉlanTMSC310 Microcontroller Pro-

grammer’s Reference Manual, order #20665. Interrupt

request from the Real-Time Clock is connected to

Channel 0 (IRQ8) of Interrupt Controller 2. IRQ13 is re-

Table 23.

Internal I/O Pulldown States

IORESET

RESIN

Force Term

Comments

Active

This condition occurs when any power source is initially turned on. The

ÉlanSC310 microcontroller’s core and analog VCC is transitioning to

on and RESIN is active (the initial power-up state). See “Micro Power

Off Mode” on page 46 for more details.

Active

This condition occurs when the core and analog VCC is stable, the

RESIN pin has been inactive, and the primary power supply outputs

are off (the normal Micro Power Off state).

Active

This condition should be treated as condition 0,0 above.

Inactive

This occurs when the secondary power supply is on, the RESIN input

is inactive, and the primary power supply is on and has deasserted

IORESET (normal system operating state).

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