PSD813F1A Datasheet, PDF (46/111 Pages) STMicroelectronics – Flash in-system programmable (ISP) peripherals for 8-bit MCUs, 5 V

PSD813F1A
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
PSD
D [7:0]
PORT
D [7:0]
ADIO
A
A [ 15: 0]
PORT
PORT
A[ 23:16]
WR
) ^RD
t(s ^BHE
uc _ALE
Obsolete ^{Product(s) - Obsolete Prod RESET}
WR (CNTRL0)
RD (CNTRL1)
BHE (CNTRL2)
RST
ALE (PD0)
PORT D
B
PORT
C
(OPTIONAL)
AI02879C
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