Rainbow-electronics AT89C5122 Manual de usuario descargar pdf (Pagina 53)

AT8xC5122/23

4202E–SCR–06/06

I/O Port Definition

Ports vs Packages Table 30. I/O Number vs Packages

Port 0 Port 0 has the following functions:

– Default function: Port 0 is an 8-bit I/O port.

– Alternate function: Port 0 is also the multiplexed low-order address and data

bus during accesses to external Program and Data Memory. In this

application, it uses strong internal pull-ups when emitting 1’s and it can drive

CMOS inputs without external pull-ups.

Port 0 has the following configurations:

– Default configuration: open drain bi-directional I/O port. Port 0 pins that have

1’s written to them float, and in this state they can be used as high-

impedance inputs.

– Configuration 2: Low speed output, “KB_OUT”

– Configuration 3: Push-pull output

P0 P1 P2 P3 P4 P5 Total

VQFP64

QFN64

88886846

VQFP32

QFN32

-8-8-117

PLCC28-6-6-113

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 212 213

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Rainbow-electronics AT89C5122 Manual de usuario Pagina 53