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T84C5112-RKFEL Fiches technique(PDF) 25 Page - ATMEL Corporation

No de pièce T84C5112-RKFEL
Description  8-bit Microcontroller with A/D converter
PDF  97 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T84C5112-RKFEL Fiches technique(HTML) 25 Page - ATMEL Corporation

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Rev. B - November 10, 2000
25
Preliminary
T80C5112
Figure 7. Push-Pull Output
9.1.4. Input only Configuration
The input only configuration is a pure input with neither pull-up nor pull-down.
The input only configuration is shown in Figure 7.
Figure 8. Input only
9.2. Ports description
9.2.1. Ports P1, P3 and P4
Every output on the T80C5112 may potentially be used as a 20 mA sink LED drive output. However, there is a
maximum total output current for all ports which must not be exceeded. All ports pins of the T80C5112 have slew
rate controlled outputs. This is to limit noise generated by quickly switching output signals. The slew rate is factory
set to approximately 10 ns rise and fall times.
The inputs of each I/O port of the T80C5112 are TTL level Schmitt triggers with hysteresis.
9.2.2. Ports P0 and P2
High pin count version of the T80C5112 have standard address and data ports P0 and P2. These ports are standard C51
ports (Quasi-bidirectional I/O). The control lines are provided on the pins : ALE, PSEN, EA, Reset; RD and WR signals
are on the bits P1.1 and P1.0 .
Input
Pin
Strong
N
P
Port latch
Data
Data
Input
Pin
Data



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