ST10F280 datasheet(95/186 Pages) STMICROELECTRONICS

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ST10F280

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The chip select lines of Port 6 have an internal weak pull-up device. This device is switched on during

reset. This feature is implemented to drive the chip select lines high during reset in order to avoid multiple

chip selection.

After reset the CS function must be used, if selected so. In this case there is no possibility to program any

port latches before. Thus the alternate function (CS) is selected automatically in this case.

Note: The open drain output option can only be selected via software earliest during the initialization

routine; at least signal CS0 will be in push/pull output driver mode directly after reset.

Figure 45 : Block Diagram of Port 6 Pins with an Alternate Output Function

* P6.5 has only alternate input function.

12.9 - Port 7

If this 8-bit port is used for general purpose I/O, the direction of each line can be configured via the corre-

sponding direction register DP7. Each port line can be switched into push/pull or open drain mode via the

open drain control register ODP7.

MUX

"0"

Open Drain

Latch

Write ODP6.y

Read ODP6.y

Direction

Latch

Write DP6.y

Read DP6.y

MUX

Input

Latch

CPU Clock

P6.y

Output

Buffer

Port Output

Latch

Read P6.y

Write P6.y

Alternate *

Data

Output

MUX

"1"

MUX

Alternate

Function

Enable

y = (0...4, 6, 7)

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