psd813f1a STMicroelectronics, psd813f1a Datasheet - Page 46

• Manufacturer Part Number: psd813f1a
• Description: Flash In-system Programmable Isp Peripherals For 8-bit Mcus, 5 V
• Manufacturer: STMicroelectronics

PSD813F1A
PSD Interface to a Non-Multiplexed 8-Bit Bus
Figure
microcontroller 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
Figure 22. An Example of a Typical 8-bit Non-Multiplexed Bus Interface
46/111
22
RESET
MCU
shows an example of a system using a
BHE
ALE
WR
RD
A [ 15:0 ]
D [ 7:0 ]
PSD
WR ( CNTRL0 )
RD ( CNTRL1 )
BHE ( CNTRL2 )
RST
ALE ( PD0 )
PORT D
PORT
ADIO
A. Port A is in tri-state mode when the PSD is not
accessed by the microcontroller. Should the sys-
tem address bus exceed sixteen bits, Ports B, C,
or D may be used for additional address inputs.
PORT
PORT
PORT
A
B
C
D [ 7:0 ]
(OPTIONAL)
A [ 23:16 ]
AI02879C