Rainbow-electronics T89C5121 Manual de usuario descargar pdf (Pagina 7)

A/T8xC5121

4164G–SCR–07/06

I/O

Input/Output function

P3.4 is a bi-directional I/O port with internal pull-ups.

Timer 0 function: External clock input

When Timer 0 operates as a counter, a falling edge on the T0 pin

increments the count.

Reset configuration

High impedance due to PMOS switched OFF

P3.5 CIO1 DV

I/O

Alternate card function

Card I/O

I/O

Input/Output function

P3.5 is a bi-directional I/O port with internal pull-ups.

Timer 1 function: External clock input

When Timer 1 operates as a counter, a falling edge on the T1 pin

increments the count.

Reset configuration

Input (high level due to internal pull-up)

P3.6 CCLK1 LED0 DV

Alternate card function

Card clock

LED function

These pins can be directly connected to the cathode of standard

LED without external current limiting resistors. The typical current

of each output can be programmed by software to 2, 4 or 10 mA

(LEDCON register).

I/O

Input/Output function

P3.6 is a LED port.

Reset configuration

Input at high level

P3.7 CRST1 DV

Alternate card function

Card reset

P3.7 CRST1 LED1 DV

O LED function

These pins can be directly connected to the cathode of standard

LED without external current limiting resistors. The typical current

of each output can be programmed by software to 2, 4 or 10 mA

(LEDCON register).

I/O Input/Output function

P3.7 is a a LED port.

I Reset configuration

Input at high level

Table 1. Ports Description (Continued)

Port

Signal

Name Alternate

Internal

Power

Supply ESD Type Description

1 2 3 4 5 6 7 8 9 10 11 12 ... 114 115

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Rainbow-electronics T89C5121 Manual de usuario Pagina 7

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