84C444 データシートの表示（PDF） - Philips Electronics

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84C444

8-bit microcontrollers with OSD and VST

Philips Electronics 

Philips Semiconductors

8-bit microcontrollers with OSD and VST

Product specification

84C44X; 84C64X; 84C84X

11 INPUT/OUTPUT (I/O)

Each parallel I/O port line may be individually configured

using one of three possible I/O mask options.

The three I/O mask options are specified below:

Option 1 Standard port with switched pull-up current

source, Fig.15.

Option 2 Open drain, Fig.16.

Option 3 Push-pull (output only), Fig.17.

Table 5 specifies the possible port option list. When these

devices are used for emulation purposes, in order to match

the piggy back device provided it is recommended that the

port options listed in Table 6 are used.

WRITE PULSE

handbook, full pOagUeTwLid/tOh RL/ANL/MOV

DATA BUS

D MQ

MASTER

D SQ

SLAVE

SQ

VDD

TR2

constant

current

TR3

source

100 µA typ.

I/O PORT

LINE

TR1

VSS

ORL/ANL/MOV

IN/MOV

MLA696

Fig.15 Standard output with switched pull-up current source (Option 1).

WRITE PULSE

handbook, full pagewidth OUTL/ORL/ANL

DATA BUS

D MQ

MASTER

D SQ

SLAVE

SQ

VDD

TR1

VSS

ORL/ANL

IN

Fig.16 Open drain type I/O (Option 2).

MLA697

I/O PORT

LINE

1996 Nov 29

16

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