ST10F280_12 datasheet(128/239 Pages) STMICROELECTRONICS

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Parallel ports

ST10F280

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Doc ID 8673 Rev. 3

ODP7

Address:

0xF1D2h / E9h ESFR

Reset:

0x--00h

Type:

R/W

12.9.1

Alternate functions of Port 7

The upper 4 lines of Port 7 (P7.7...P7.4) serve as capture inputs or 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 (200 ns sample rate at 40MHz CPU clock).

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 XORed 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 invert its level at the pin (port

latch holds a ‘1’).

Note that the PWM outputs must be enabled via the respective PENx bits in PWMCON1.

The table below summarizes the alternate functions of Port 7.

765

4321

ODP7.7 ODP7.6 ODP7.5 ODP7.4 ODP7.3 ODP7.2 ODP7.1 ODP7.0

R/W

ODP7.y Port 7 Open Drain control register bit y

ODP7.y = 0: Port line P7.y output driver in push-pull mode

ODP7.y = 1: Port line P7.y output driver in open drain mode

Table 23.

Port 7 alternate functions

Port 7 pin

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

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