ST10F280_12 datasheet(132/239 Pages) STMICROELECTRONICS

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Parallel ports

ST10F280

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12.10.1

Alternate functions of Port 8

The 8 lines of Port 8 (P8.7...P8.0) serve as capture inputs or compare outputs

(CC23IO...CC16IO) 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 P8.7...P8.0 can also be used

as external interrupt inputs (200 ns sample rate at 40MHz CPU clock).

The Table 24 summarizes the alternate functions of Port 8.

Figure 49.

Port 8 I/O and alternate functions

The port structures of Port 8 differ in the way the output latches are connected to the internal

bus and to the pin driver (see the Figure 50). Pins P8.7...P8.0 (CC23IO...CC16IO) combine

internal bus data and alternate data output before the port latch input, as do the Port 2 pins.

Table 24.

Port 8 alternate functions

Port 7

Alternate function

P8.0

P8.1

P8.2

P8.3

P8.4

P8.5

P8.6

P8.7

CC16IO Capture input / compare output channel 16

CC17IO Capture input / compare output channel 17

CC18IO Capture input / compare output channel 18

CC19IO Capture input / compare output channel 19

CC20IO Capture input / compare output channel 20

CC21IO Capture input / compare output channel 21

CC22IO Capture input / compare output channel 22

CC23IO Capture input / compare output channel 23

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