ST10F280_12 datasheet(107/239 Pages) STMICROELECTRONICS

107 / 239 page

ST10F280

Parallel ports

Doc ID 8673 Rev. 3

107/239

DP2

Address:

0xFFC2h / E1h SFR

Reset:

0x0000h

Type:

R/W

ODP2

Address:

0xF1C2h / E1h ESFR

Reset:

0x0000h

Type:

R/W

12.4.1

Alternate functions of Port 2

All Port 2 lines (P2.15...P2.0) serve as capture inputs or compare outputs (CC15IO...CC0IO)

for the CAPCOM1 unit.

When a Port 2 line is used as a capture input, the state of the input latch, which represents

the state of the port pin, is directed to the CAPCOM unit via the line “Alternate Pin Data

Input”. If an external capture trigger signal is used, the direction of the respective pin must

be set to input. If the direction is set to output, the state of the port output latch will be read

since the pin represents the state of the output latch. This can be used to trigger a capture

event through software by setting or clearing the port latch. Note that in the output

configuration, no external device may drive the pin, otherwise conflicts would occur.

When a Port 2 line is used as a compare output (compare modes 1 and 3), the compare

event (or the timer overflow in compare mode 3) directly effects the port output latch. In

compare mode 1, when a valid compare match occurs, the state of the port output latch is

read by the CAPCOM control hardware via the line “Alternate Latch Data Input”, inverted,

and written back to the latch via the line “Alternate Data Output”.

R/W

DP2.y Port direction register DP2 bit y

DP2.y = 0: Port line P2.y is an input (high-impedance)

DP2.y = 1: Port line P2.y is an output

R/W

ODP2.y Port 2 Open Drain control register bit y

ODP2.y = 0: Port line P2.y output driver in push/pull mode

ODP2.y = 1: Port line P2.y output driver in open drain mode

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