NT6880 Datasheet, PDF(6/13 Page) List of Unclassifed Manufacturers

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NT6880 Datasheet, PDF (6/13 Pages) List of Unclassifed Manufacturers – Keyboard Controller

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NT6880

9. I/O PORTs

The NT6880 has 31 pins dedicated to input and output. These pins are grouped into 6 ports, as follows:

9.1. PORT0: (P00 - P07)

PORT0 is an 8-bit bi-directional CMOS I/O port that is internally pulled High by PMOS. Each pin of PORT0 can be bit

programmed as an input or output pin under the software control. When programmed as output, data is latched to the port

data register and output to the pin. PORT0 pins with ''1'' written to them are pulled high by the internal PMOS pull-ups, and

are used as inputs in that state. These input signals can then be read. The port output is High after reset.

9.2. PORT1: ( P10 - P17 ): Functions are the same as PORT0.

9.3. PORT2: ( P20 - P27) : Functions are the same as PORT0.

9.4. PORT3: ( P30 - P34) : Functions are the same as PORT0.

CLK & DATA

: These two pins have the same structure as I/O ports.

PORT Registers:

Addr.

$00C3

$00C4

$00C5

$00C6

$00C7

$00C8

PORT0

PORT1

PORT2

PORT3

CLK

DATA

Bit7

PD07

PD17

PD27

Bit6

PD06

PD16

PD26

Bit5

PD05

PD15

PD25

Bit4

PD04

PD14

PD24

PD34

Bit3

PD03

PD13

PD23

PD33

Bit2

PD02

PD12

PD22

PD32

Bit1

PD01

PD11

PD21

PD31

Bit0

PD00

PD10

PD20

PD30

CLK

DATA

R/W

(RW)

WREN

RST

Latch

D SD

V DD

Weak PMOS

RDENB

Figure 9.1. I/O Port Structure

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