Rainbow-electronics AT89LP214 Manual de usuario descargar pdf (Pagina 26)

3538A–MICRO–7/06

AT89LP213/214 [Preliminary]

13.4 Port Alternate Functions

Most general-purpose digital I/O pins of the AT89LP213/214 share functionality with the various

I/Os needed for the peripheral units. Table 13-5 lists the alternate functions of the port pins.

Alternate functions are connected to the pins in a logic AND fashion. In order to enable the

alternate function on a port pin, that pin must have a “1” in its corresponding port register bit,

otherwise the input/output will always be “0”. Furthermore, each pin must be configured

for the correct input/output mode as required by its peripheral before it may be used as such.

Table 13-4 shows how to configure a generic pin for use with an alternate function.

Table 13-4. Alternate Function Configurations for Pin y of Port x

PxM0.y PxM1.y Px.y I/O Mode

0 0 1 bidirectional (internal pull-up)

0 1 1 output

1 0 X input

1 1 1 bidirectional (external pull-up)

Table 13-5. Port Pin Alternate Functions

Port Pin

Configuration Bits

Alternate

Function NotesPxM0.y PxM1.y

P1.0 P1M0.0 P1M1.0

AIN0 input-only

GPI0

P1.1 P1M0.1 P1M1.1

AIN1 input-only

GPI1

P1.2 P1M0.2 P1M1.2 GPI2

P1.3 P1M0.3 P1M1.3 GPI3 RST

must be disabled

P1.4 P1M0.4 P1M1.4

GPI4

P1.5 P1M0.5 P1M1.5

MOSI

GPI5

P1.6 P1M0.6 P1M1.6

MISO

GPI6

P1.7 P1M0.7 P1M1.7

SCK

GPI7

P3.0 P3M0.0 P3M1.0 RXD

AT89LP214 Only

P3.1 P3M0.1 P3M1.1 TXD

P3.2 P3M0.2 P3M1.2 INT0 Internal RC Oscillator Only

P3.3 P3M0.3 P3M1.3

INT1

Internal RC Oscillator or

External Clock Source Only

CLKOUT

P3.4 P3M0.4 P3M1.4 T0

AT89LP213 Only

P3.5 P3M0.5 P3M1.5 T1

P3.6 not configurable CMPOUT Pin is tied to comparator output

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 89 90

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Rainbow-electronics AT89LP214 Manual de usuario Pagina 26

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