PSD834F2-15J STMicroelectronics, PSD834F2-15J Datasheet - Page 40

• Manufacturer Part Number: PSD834F2-15J
• Manufacturer: STMicroelectronics

Specifications of PSD834F2-15J

• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Package Type: PLCC
• Mounting: Surface Mount
• Pin Count: 52
• Lead Free Status / RoHS Status: Compliant

PSD834F2V
PSD Interface to a Non-Multiplexed 8-bit Bus.
Figure 17 shows an example of a system using a
MCU with an 8-bit non-multiplexed bus and a
PSD. The address bus is connected to the ADIO
Port, and the data bus is connected to Port A. Port
A is in tri-state mode when the PSD is not ac-
cessed by the MCU. Should the system address
bus exceed sixteen bits, Ports B, C, or D may be
used for additional address inputs.
Figure 17. An Example of a Typical 8-bit Non-Multiplexed Bus Interface
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RESET
MCU
BHE
ALE
WR
RD
A [ 15:0 ]
D [ 7:0 ]
PSD
WR ( CNTRL0 )
RD ( CNTRL1 )
BHE ( CNTRL2 )
RST
ALE ( PD0 )
PORT D
PORT
ADIO
Data Byte Enable Reference. MCUs have differ-
ent data byte orientations. Table 15 shows how
the PSD interprets byte/word operations in differ-
ent bus WRITE configurations. Even-byte refers to
locations with address A0 equal to 0 and odd byte
as locations with A0 equal to 1.
Table 15. 8-bit Data Bus
BHE
X
X
PORT
PORT
PORT
A
B
C
A0
D [ 7:0 ]
0
1
(OPTIONAL)
A [ 23:16 ]
Even Byte
Odd Byte
D7-D0
AI02879C