ZPSD302B-90JI View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ZPSD302B-90JI Datasheet PDF : 85 Pages
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PSD3XX Family
10.
I/O Port
Functions
(cont.)
10.3.2 Port B (PB0-PB7) in 16-bit Multiplexed Address/Data Mode
In this mode, Port B becomes the low-order data bus byte to the MCU chip. When reading
an internal high-order location, data is presented on Port B pins to the MCU. When writing
to an internal high-order location, data present on Port B pins from the MCU is written to the
desired location.
Figure 6. Port B Pin Structure
READ PIN
I
I
N
N
T
T
READ DATA
E
E
R
R
N
N
A
A WRITE DATA
L
L
CK
MCU
I/O
OUT
CMOS/OD (1)
PORT B PIN
DFF
C
D
S
A
DR
ENABLE
O
T
U
A
Dn
MUX
T
B
) B
U
t(s U
S
S
CSn
uc D
d C
8
ro S
•
READ DIR
0
•
P •
•
te •
D
•
1
le 7
5
WRITE DIR
D
DIR
CK FF
R
o RESET
CONTROL
Obsolete Product(s) - Obs NOTE: 1. CMOS/OD determines whether the output is open drain or CMOS.
19
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