ST10F296 datasheet(131/346 Pages) STMICROELECTRONICS

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DP1L and DP1H registers

13.3.2

Alternate functions of Port 1

When a demultiplexed external bus is enabled, Port 1 is used as an address bus. Note that

demultiplexed bus modes use Port 1 as a 16-bit port. Otherwise all 16 port lines can be used

for general purpose I/O. The upper four pins of Port 1 (P1H.7 to P1H.4) are also capture

input lines for the CAPCOM2 unit (CC27-24 I).

The capture input functions of pins P1H.7 to P1H.4 can be used for external interrupt inputs

with a sample rate of eight CPU clock cycles.

As a side effect, the capture input capability of these lines can also be used in the address

bus mode. Changes of the upper address lines may be detected, thereby triggering an

interrupt request that performs some special service routines. External capture signals can

only be applied if no address output is selected for Port 1.

During external access in demultiplexed bus modes, Port 1 outputs the 16-bit intra-segment

address as an alternate output function.

During external access in multiplexed bus modes, when no BUSCON register selects a de-

multiplexed bus mode, Port 1 is not used and is available for general purpose I/O.

DP1L (F104h/82h)

ESFR

Reset value: --00h

765

43210

Reserved

DP1L

DP1H (F106h/83h)

ESFR

Reset value: --00h

654

3210

Reserved

DP1H

Table 70.

DP1L and DP1H register description

Bit

Bit name

Function

15-8

Reserved

7-0

DP1X.y

Port direction register DP1L or DP1H bit y

0: Port line P1X.y is an input (high impedance)

1: Port line P1X.y is an output

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