ST10F296 datasheet(155/346 Pages) STMICROELECTRONICS

155 / 346 page

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ST10F296E

Parallel ports

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Figure 49.

Port 6 I/O and alternate functions

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

on under the following conditions:

●

During reset

●

If Port 6 line is used as a chip select output, the ST10F296E is in hold mode, and the

respective pin driver is in push-pull mode (ODP6.x = 0).

The pull-up device is implemented to drive the chip select lines high during reset to avoid

multiple chip selection and to allow another master to access the external memory via the

same chip select lines (AND-wired) while the ST10F296E is in hold mode.

When ODP6.x = 1 (open-drain output selected), the internal pull-up device is active during

hold mode and external pull-up devices must be used in this case. When entering hold

mode the CS lines are actively driven high for one clock phase, at which point the output

level is controlled by the pull-up devices (if activated).

After reset the CS function must be used. In this case, the port latches cannot be

programmed and the alternate function (CS) is selected automatically.

Table 92.

Port 6 alternate functions

Port 6

Alternate function

CSSEL = 10

Alternate function

CSSEL = 01

Alternate function

CSSEL = 00

Alternate function

CSSEL = 11

P6.0

General purpose I/O

Chip select CS0

P6.1

General purpose I/O

Chip select CS1

P6.2

General purpose I/O

SCLK1

General purpose I/O

SCLK1

Chip select CS2

SCLK1

Chip select CS2

SCLK1

P6.3

General purpose I/O

MTSR1

General purpose I/O

MTSR1

General purpose I/O

MTSR1

Chip select CS3

MTSR1

P6.4

General purpose I/O

MRST1

General purpose I/O

MRST1

General purpose I/O

MRST1

Chip select CS4

MRST1

P6.5

HOLD external hold request input

P6.6

HLDA hold acknowledge output

P6.7

BREQ bus request output

Port 6

Alternate function

(a)

General purpose input/output

(b)

XSSC input/output

Bus arbitration

P6.7

P6.6

P6.5

P6.4

P6.3

P6.2

P6.1

P6.0

BREQ

HLDA

HOLD

CS4

CS3

CS2

CS1

CS0

BREQ

HLDA

HOLD

MRST1

MTSR1

SCLK1

CS1

CS0

Obsolete

Product(s)

- Obsolete

Product(s)

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