Rainbow-electronics AT89C5122 Manual do Utilizador descarregar pdf (Página 56)

AT8xC5122/23

4202E–SCR–06/06

Port 4 Port 4 has the following functions:

– Default function: Port 4 is an 6-bit I/O port.

– Alternate functions: see table below

Port 4 has the following configurations:

– Default configuration: Pseudo bi-directional “Port51” digital input/output with

internal pull-ups.

– Alternate configurations: See Table 33.

Table 33. Port 4 Description

Port 5 Port 5 has the following functions:

– Default function: Port 5 is an 8-bit I/O port.

– Alternate function 1: Port 5 is an 8-bit keyboard port KB0 to KB7.

Port 5 has the following configurations:

– Default configuration: Pseudo bi-directional “Port51” digital input/output with

internal pull-ups.

– Alternate configuration: see Table 34.

Table 34. Port 5 Description

Port

Alternate Functions Configurations

Signal Description Mode 1 Mode 2 Mode 3

P4.0 MISO SPI Master In Slave Out I/O

P4.1 MOSI SPI Master Out Slave In I/O

P4.2 SCK SPI clock

P4.3 Push-pull KB_OUT Input MPU

P4.4 Push-pull KB_OUT Input MPU

P4.5 Push-pull KB_OUT Input MPU

Port

Configurations

Mode 1 Mode 2 Mode 3 Comments

P5.0 Push-pull Input MPU Input WPU

First clusterP5.1 Push-pull Input MPU Input WPU

P5.2 Push-pull Input MPU Input WPU

P5.3 Push-pull Input WPD Input WPU

Second cluster

P5.4 Push-pull Input WPD Input WPU

P5.5 Push-pull Input WPD Input WPU

P5.6 Push-pull Input WPD Input WPU

Third cluster

P5.7 Push-pull Input WPD Input WPU

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 212 213

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