ST10F280 datasheet(70/186 Pages) STMICROELECTRONICS

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ST10F280

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12 - PARALLEL PORTS

In order to accept or generate single external con-

trol signals or parallel data, the ST10F280 pro-

vides up to 143 parallel I/O lines, organized into

two 16-bit I/O port (Port 2, XPort9), eight 8-bit I/O

ports (PORT0 made of P0H and P0L, PORT1

made of P1H and P1L, Port 4, Port 6, Port 7,

Port 8) , one 15-bit I/O port (Port 3) and two 16-bit

input port (Port 5, XPort10).

These port lines may be used for general purpose

Input/Output, controlled via software, or may be

used implicitly by ST10F280’s integrated periph-

erals or the External Bus Controller.

All port lines are bit addressable, and all input/out-

put lines are individually (bit-wise) programmable

as inputs or outputs via direction registers (except

Port 5, XPort10). The I/O ports are true bidirec-

tional ports which are switched to high impedance

state when configured as inputs. The output driv-

ers of seven I/O ports (2, 3, 4, 6, 7, 8, 9) can be

configured (pin by pin) for push/pull operation or

open-drain operation via ODPx control registers.

The output driver of the pads are programmable to

adapt the edge characteristics to the application

requirement and to improve the EMI behaviour.

This is possible using the POCONx registers for

Ports P0L, P0H, P1L, P1H, P2, P3, P4, P6, P7,

P8. The output driver capabilities of ALE, RD and

WR control lines are programmable with the dedi-

cated bits of POCON20 control register.

The input threshold levels are programmable

(TTL/CMOS) for five ports (2, 3, 4, 7, 8) with the

PICON register control bits. The logic level of a pin

is clocked into the input latch once per state time,

regardless whether the port is configured for input

or output.

A write operation to a port pin configured as an

input causes the value to be written into the port

output latch, while a read operation returns the

latched state of the pin itself. A read-modify-write

operation reads the value of the pin, modifies it,

and writes it back to the output latch.

Writing

configured

output

(DPx.y=‘1’) causes the output latch and the pin to

have the written value, since the output buffer is

enabled. Reading this pin returns the value of the

output latch. A read-modify-write operation reads

the value of the output latch, modifies it, and

writes it back to the output latch, thus also modify-

ing the level at the pin.

Note: The new I/O ports (XPort9, XPort10) are

not mapped on the SFR space but on the

internal XBUS interface . The XPort9 and

XPort10 are enabled by setting XPEN bit 2

of the SYSCON register and bit 3 of the

new XPERCON register. On the XBUS

interface, the registers are not bit-address-

able.

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