PCA84C441 PHILIPS [NXP Semiconductors], PCA84C441 Datasheet - Page 16

• Manufacturer Part Number: PCA84C441
• Description: 8-bit microcontrollers with OSD and VST
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
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
Option 2 Open drain, Fig.16.
Option 3 Push-pull (output only), Fig.17.
1996 Nov 29
handbook, full pagewidth
handbook, full pagewidth
8-bit microcontrollers with OSD and VST
OUTL/ORL/ANL/MOV
source, Fig.15.
WRITE PULSE
DATA BUS
OUTL/ORL/ANL
WRITE PULSE
Fig.15 Standard output with switched pull-up current source (Option 1).
DATA BUS
ORL/ANL/MOV
MASTER
D
MQ
MASTER
ORL/ANL
Fig.16 Open drain type I/O (Option 2).
D
MQ
D
SLAVE
SQ
SQ
D
SLAVE
IN/MOV
16
SQ
SQ
IN
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.
TR2
TR1
84C44X; 84C64X; 84C84X
TR1
V SS
V SS
V DD
MLA697
TR3
MLA696
constant
current
source
100 A typ.
I/O PORT
LINE
Product specification
I/O PORT
LINE
V DD