ST10F269ZX datasheet(87/184 Pages) STMICROELECTRONICS

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ST10F269

12 - PARALLEL PORTS

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12.10.1 - Alternate Functions of Port 7

The upper 4 lines of Port 7 (P7.7...P7.4) serve as

capture

inputs

compare

outputs

(CC31IO...CC28IO) for the CAPCOM2 unit.

The usage of the port lines by the CAPCOM unit,

its accessibility via software and the precautions

are the same as described for the Port 2 lines.

As all other capture inputs, the capture input

function of pins P7.7...P7.4 can also be used as

external interrupt inputs (200ns sample rate at

40MHz CPU clock on PQFP144 devices and

250ns sample rate at 32MHz CPU clock on

TQFP144 devices).

The lower 4 lines of Port 7 (P7.3...P7.0) serve as

outputs

from

the

PWM

module

(POUT3...POUT0).

At these pins the value of the respective port

output latch is EXORed with the value of the PWM

output rather than ANDed, as the other pins do.

This allows to use the alternate output value either

as it is (port latch holds a ‘0’) or to invert its level at

the pin (port latch holds a ‘1’).

Note that the PWM outputs must be enabled via

the respective PENx bit in PWMCON1.

The Table 24 summarizes the alternate functions

of Port 7.

Table 24 : Port 7 Alternate Functions

Port 7

Alternate Function

P7.0

P7.1

P7.2

P7.3

P7.4

P7.5

P7.6

P7.7

POUT0

PWM mode channel 0 output

POUT1

PWM mode channel 1 output

POUT2

PWM mode channel 2 output

POUT3

PWM mode channel 3 output

CC28IO

Capture input / compare output channel 28

CC29IO

Capture input / compare output channel 29

CC30IO

Capture input / compare output channel 30

CC31IO

Capture input / compare output channel 31

Figure 39 : Port 7 I/O and Alternate Functions