ELANSC310 datasheet(51/119 Pages) AMD

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Élan™SC310 Microcontroller Data Sheet

PREL IMINARY

served for the coprocessor in a PC/AT system and is

unavailable on the ÉlanSC310 microcontroller. The

other interrupts are available to external peripherals as

in the PC/AT architecture via the IRQ15, IRQ14,

IRQ12–IRQ9, IRQ7–IRQ3, and IRQ1 inputs. Other

sources of interrupts are SMI/NMI and the PIRQ1–

PIRQ0 inputs.

The ÉlanSC310 microcontroller interrupt controller has

programmable sources for interrupts. These program-

mable sources are controlled by the configuration reg-

isters. For more information, see Chapter 4 of the

ÉlanTMSC310 Microcontroller Programmer’s Refer-

ence Manual, order #20665.

The Interrupt controller provides interrupt information

to the ÉlanSC310 microcontroller power management

unit to allow the monitoring of system activity. The

ÉlanSC310 microcontroller power management unit

can then use the interrupt activity to control the Power

Management mode of the ÉlanSC310 microcontroller.

For more information, see

ÉlanTMSC310 Microcontrol-

ler Programmer’s Reference Manual, order #20665.

DMA Controller

The ÉlanSC310 microcontroller DMA controller is func-

tionally compatible with the standard cascaded 8237

controller pair. Channels 0, 1, 2, and 3 are externally

available 8 bit channels. DMA Channel 4 is the cas-

cade channel. Channels 5, 6, and 7 are externally

available as 16 bit channels.

All the DMA channels are masked off on hardware

reset or when writing the DMA master reset register.

Note: To enable the master to percolate the request to

the CPU, you must also unmask the cascade channel

(0) on the master.

The ÉlanSC310 microcontroller supports the power-

saving clock stop feature that causes the clock to the

DMA controller to stop except when actually needed to

perform a DMA transfer. For more information about

clock states and programmable clock frequencies, see

Table 22 on page 45.

The ÉlanSC310 microcontroller supports Single,

Block, and Demand transfer modes; however, soft-

ware-initiated DMA requests, Cascade mode for addi-

tional external DMA controllers, and Verify mode are

not supported.

For more information about the DMA controller, see the

ÉlanTMSC310 Microcontroller Programmer’s Refer-

ence Manual, order #20665.

Counter/Timer

The ÉlanSC310 microcontroller’s counter/timer is func-

tionally compatible with the 8254 device. A 3-channel,

general-purpose, 8254 compatible, 16-bit counter/

timer is integrated into the ÉlanSC310 microcontroller.

It can be programmed to count in binary or in Binary

Coded Decimal (BCD). Each counter operates inde-

pendently of the other two and can be programmed for

operation as a timer or a counter. All three are con-

trolled from a common set of control logic, which pro-

vides controls to load, read, configure, and control

each counter.

All of the 8254 compatible counter/timer channels are

driven from a common clock that is internally generated

from the LS_PLL 1.1892-MHz output. The output of

Counter 0 is connected to IRQ0.

Additional Peripheral Controllers

The ÉlanSC310 microcontroller also integrates three

other peripheral controllers commonly found in PCs,

but not considered part of the “core peripherals,”

namely a serial port or a Universal Asynchronous Re-

ceiver Transmitter (UART), a bidirectional and EPP-en-

hanced parallel port, and a real-time clock (RTC). See

Chapter 3 of the

ÉlanTMSC310 Microcontroller Pro-

grammer’s Reference Manual, order #20665.

16450 UART

The ÉlanSC310 microcontroller chip includes a UART,

providing ÉlanSC310 microcontroller systems with a

serial port. This serial controller is fully compatible with

the industry-standard 16450. In handheld systems, this

port can connect to the pen input device or to a modem.

Real-Time Clock

The ÉlanSC310 microcontroller contains a fully

146818A-compatible real-time clock (RTC) imple-

mented in a PC/AT-compatible fashion. The RTC

drives its interrupt to power-management logic.

The RTC block in the ÉlanSC310 microcontroller con-

sists of a time-of-day clock with alarm and 100-year

calendar. The clock/calendar can be represented in bi-

nary or BCD. It has a programmable periodic interrupt,

and 114 bytes of general purpose static RAM (an ex-

tension of the 146818A standard, see the program-

me r ’ s r e f e r ence m anu al fo r m o r e de tail s ) .

Parallel Port

The ÉlanSC310 microcontroller parallel port is func-

tionally compatible with the PS/2 parallel port. The

ÉlanSC310 microcontroller parallel port interface pro-

vides the parallel port control outputs and status inputs,

and also the control signals for the parallel port data

buffers. The parallel port data path is external to the

ÉlanSC310 microcontroller. This interface can be con-

figured to operate in either a Unidirectional (Normal)

mode or Bidirectional (EPP) mode.

The unidirectional parallel port requires only one exter-

nal component, the parallel port data latch. This latch is

used to latch the data from the data bus and drive the

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