ELANSC310 datasheet(21/119 Pages) AMD

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Élan™SC310 Microcontroller Data Sheet

PREL IMINARY

PIN STATE TABLES

The Pin State tables beginning on page 22 are grouped

by function based on their primary function when the

ÉlanSC310 microcontroller is configured at reset for

the internal LCD Controller mode (NAME1). The Pin

State tables also show the I/O type and reset state for

those pins that have been configured at reset for either

Local Bus mode or Maximum ISA Bus mode.

Pin Characteristics

The following information clarifies the meaning of the

Pin State tables beginning on page 22:

The letters in the I/O Type column of Tables 2–10 mean

the following:

– Input

O– Output

STI – Schmitt Trigger Input

– Bidirectional

A– Analog

The Term column refers to internal termination. The

letters in this column of Tables 2–10 mean the follow-

ing:

PD – Pull-down resistor

PU – Pull-up resistor

The symbols (letters) in the Drive Type column specify

the drive capability of output pins. These specifications

can be found in the DC Characteristics section begin-

ning on page 70 of this document. For a more complete

description of I/O Drive Types, see “Derating Curves”

on page 73 and Table 42 on page 73.

The Clock Off column describes the logic level of the

I/O pins while the ÉlanSC310 microcontroller is in any

of the power management modes where the CPU clock

is stopped, and power is still applied to both the VCCIO

and VCC clamp supply pins associated with that I/O

pin.

The Reset State column lists the I/O pin voltage level

when all of the VCC pins are stable and the RESIN

input is active. The level of the VCC pins correlating to

this data is shown in Table 1.

The VCCIO column refers to the voltage supply pin on

the ÉlanSC310 microcontroller that is directly con-

nected to the output driver for the specified signal pin.

The VCC Clamp column refers to the voltage supply

pin on the ÉlanSC310 microcontroller that is directly

connected to the ESD protection diode (cathode) for

the specified signal pin. Any pin with a 5-V VCC Clamp

is a “5-V safe” input.

The Spec. Load (specification load) column is used to

determine derated AC timing. See of “Derating Curves”

on page 73 of this data sheet.

Table 1.

I/O Pin Voltage Level

Pin Name

Local

Bus (V)

Maximum

ISA (V)

VCC

3.3

AVCC

3.3

VCC5

5.0

VSYS2

3.3

5.0

VSYS

5.0

VMEM

3.3

VCC1

3.3

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