ST10F269Z1Q6 datasheet(61/184 Pages) STMICROELECTRONICS

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ST10F269

12 - PARALLEL PORTS

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The table lists the defined POCON registers and the allocation of control bit-fields and port pins.

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 / 55h)

ESFR

Reset Value: --00h

Table 18 : Port Control Register Allocation

Control

Physical

Address

8-bit

Address

Controlled Port Nibble

210

POCON0L

F080h

40h

P0L.7...4

P0L.3...0

POCON0H

F082h

41h

P0H.7...4

P0H.3...0

POCON1L

F084h

42h

P1L.7...4

P1L.3...0

POCON1H

F086h

43h

P1H.7...4

P1H.3...0

POCON2

F088h

44h

P2.15...12

P2.11...8

P2.7...4

P2.3...0

POCON3

F08Ah

45h

P3.15, 3.13, 3.12

P3.11...8

P3.7...4

P3.3...0

POCON4

F08Ch

46h

P4.7...4

P4.3...0

POCON6

F08Eh

47h

P6.7...4

P6.3...0

POCON7

F090h

48h

P7.7...4

P7.3...0

POCON8

F092h

49h

P8.7...4

P8.3...0

9876543210

--------

PN1DC

PN1EC

PN0DC

PN0EC

RD, WR Edge Characteristic (rise/fall time)

00:

Fast edge mode, rise/fall times depend on the size of the driver.

01:

Slow edge mode, rise/fall times ~60 ns

10:

Reserved

11:

Reserved

PN0DC

RD, WR Driver Characteristic (output current)

00:

High Current mode:

Driver always operates with maximum strength.

01:

Dynamic Current mode:

Driver strength is reduced after the target level has been reached.

10:

Low Current mode:

Driver always operates with reduced strength.

11:

Reserved

PN1EC

ALE Edge Characteristic (rise/fall time)

00:

Fast edge mode, rise/fall times depend on the size of the driver.

01:

Slow edge mode, rise/fall times ~60 ns

10:

Reserved

11:

Reserved

PN1DC

ALE Driver Characteristic (output current)

00:

High Current mode:

Driver always operates with maximum strength.

01:

Dynamic Current mode:

Driver strength is reduced after the target level has been reached.

10:

Low Current mode:

Driver always operates with reduced strength.

11:

Reserved

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