ST10F280 datasheet(75/186 Pages) STMICROELECTRONICS

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ST10F280

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Dedicated Pins Output Control

Programmable pad drivers also are supported for the dedicated pins ALE, RD and WR. For these pads, a

special POCON20 register is provided.

POCON20 (F0AAh / 5h)

ESFR

Reset Value: 0000h

12.1.4 - Alternate Port Functions

Each port line has one associated programmable

alternate input or output function. PORT0 and

PORT1 may be used as the address and data

lines when accessing external memory.

Port 4 outputs the additional segment address bits

A23/A19/A18/A16 in systems where more than

64 KBytes of memory are to be accessed directly.

Port 6 provides the optional chip select outputs

and the bus arbitration lines.

Port 2, Port 7 and Port 8 are associated with the

capture inputs or compare outputs of the CAPCOM

units and/or with the outputs of the PWM module.

Port 2 is also used for fast external interrupt inputs

and for timer 7 input.

Port 3 includes alternate input/output functions of

timers, serial interfaces, the optional bus control

signal BHE/WRH and the system clock output

(CLKOUT).

Port 5 is used for the analog input channels to the

A/D converter or timer control signals.

If an alternate output function of a pin is to be

used, the direction of this pin must be pro-

grammed for output (DPx.y=‘1’), except for some

signals that are used directly after reset and are

configured

automatically.

Otherwise

the

remains in the high-impedance state and is not

effected by the alternate output function. The

respective port latch should hold a ‘1’, because its

output is ANDed with the alternate output data

(except for PWM output signals).

If an alternate input function of a pin is used, the

direction of the pin must be programmed for input

(DPx.y=‘0’) if an external device is driving the pin.

The input direction is the default after reset. If no

external device is connected to the pin, however,

one can also set the direction for this pin to output.

In this case, the pin reflects the state of the port

output latch. Thus, the alternate input function

reads the value stored in the port output latch.

This can be used for testing purposes to allow a

software trigger of an alternate input function by

writing to the port output latch.

9876543210

--------

PN1DC

PN1EC

PN0DC

PN0EC

Bit

Function

PN0EC

RD, WR Edge Characteristic (rise/fall time)

Fast edge mode, rise/fall times depend on the driver’s dimensioning.

Slow edge mode, rise/fall times ~60 ns

Reserved

PN0DC

RD, WR Driver Characteristic (output current)

High Current mode:Driver always operates with maximum strength.

Dynamic Current mode:Driver strength is reduced after the target level has been reached.

Low Current mode:Driver always operates with reduced strength.

Reserved

PN1EC

ALE Edge Characteristic (rise/fall time)

Fast edge mode, rise/fall times depend on the driver’s dimensioning.

Slow edge mode, rise/fall times ~60 ns

Reserved

PN1DC

ALE Driver Characteristic (output current)

High Current mode:Driver always operates with maximum strength.

Dynamic Current mode:Driver strength is reduced after the target level has been reached.

Low Current mode:Driver always operates with reduced strength.

Reserved

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