ST10F296 datasheet(140/346 Pages) STMICROELECTRONICS

140 / 346 page

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ST10F296E

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Figure 38.

Port 3 I/O and alternate functions

The structure of the Port 3 pins depends on their alternate function (see Figure 39).

When the on-chip peripheral associated with a Port 3 pin is configured to use the alternate

input function, it reads the input latch, which represents the state of the pin, via the line

labeled ‘alternate data input’. Port 3 pins with alternate input functions are: T0IN, T2IN,

T3IN, T4IN, T3EUD and CAPIN.

When the on-chip peripheral associated with a Port 3 pin is configured to use the alternate

output function, its ‘alternate data output’ line is ANDed with the port output latch line. When

using these alternate functions, the user must set the direction of the port line to output

(DP3.y = 1) and the port to output latch (P3.y = 1).If this is not done, the pin is in its high

impedance state (when configured as input) or the pin is stuck at 0 (when the port output

latch is cleared). When the alternate output functions are not used, the ‘alternate data

output’ line is in its inactive state, which is a high level (1). Port 3 pins with alternate output

functions are: T6OUT, T3OUT, TxD0, BHE and CLKOUT.

When the on-chip peripheral associated with a Port 3 pin is configured to use both the

alternate input and output function, the descriptions above apply to the respective current

operating mode. The direction must be set accordingly. Port 3 pins with alternate

input/output functions are: MTSR0, MRST0, RxD0 and SCLK0.

Note:

Enabling the CLKOUT function automatically enables the P3.15 output driver. Setting bit

DP3.15 = 1 is not required.

Port 3

No pin

Alternate functions

(a)

(b)

General purpose

input/output

P3.7

P3.6

P3.5

P3.4

P3.3

P3.2

P3.1

P3.0

P3.15

P3.13

P3.12

P3.11

P3.10

P3.9

P3.8

T2IN

T3IN

T4IN

T3EUD

T3OUT

CAPIN

T6OUT

T0IN

CLKOUT

SCLK0

BHE

RxD0

TxD0

MTSR0

MRST0

WRH

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Product(s)

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Product(s)

ST10F296 数据表(PDF) 140 Page - STMicroelectronics

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