PSD813F1V Datasheet, PDF (46/110 Pages) STMicroelectronics – Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 3.3V

PSD813F1V
PSD Interface to a Non-Multiplexed 8-Bit Bus
Figure 22 shows an example of a system using a
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
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.
Figure 22. An Example of a Typical 8-bit Non-Multiplexed Bus Interface
MCU
D[ 7:0]
A[ 15:0]
WR
RD
BHE
ALE
RESET
PSD
ADIO
PORT
WR (CNTRL0)
RD (CNTRL1)
BHE (CNTRL2)
RST
ALE (PD0)
PORT D
PORT
A
PORT
B
PORT
C
D[ 7:0]
A[ 23:16]
(OPTIONAL)
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