PSD4204F3 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'PSD4204F3' PDF : 93 Pages View PDF
PSD4000 Series
The
PSD4000
Functional
Blocks
(cont.)
Preliminary Information
9.3 Microcontroller Bus Interface
The “no-glue logic” PSD4000 Microcontroller Bus Interface can be directly connected to
most popular microcontrollers and their control signals. Key 16-bit microcontrollers with
their bus types and control signals are shown in Table 14. The MCU interface type is
specified using the PSDsoft.
Table 14. Microcontrollers and their Control Signals
MCU
CNTL0 CNTL1 CNTL2 PD3 PD0** ADIO0 PF3-PF0
68302, 68306
R/W
LDS
UDS
*
AS
–
*
MMC2001
68330, 68331
68332, 68340
R/W
DS
SIZ0
*
AS
A0
*
68LC302,
MMC2001
WEL
OE
WEH
AS
–
*
68HC16
R/W
DS
SIZ0
*
AS
A0
*
68HC912
R/W
E
LSTRB DBE
E
A0
*
68HC812***
R/W
E
LSTRB
*
*
A0
*
80196
WR
RD
BHE
*
ALE
A0
*
80196SP
WRL
RD
*
WRH ALE
A0
*
80186
WR
RD
BHE
*
ALE
A0
*
80C161
80C164-80C167 WR
RD
BHE
*
ALE
A0
*
80C51XA
WRL
RD PSEN WRH ALE A4/D0 A3-A1
H8/3044
M37702M2
WRL
RD
*
WRH
AS
A0
–
R/W
E
BHE
*
ALE
A0
*
***Unused CNTL2 pin can be configured as GPLD input. Other unused pins (PD3-0, PF3-0) can be
***configured for other I/O functions.
***ALE/AS input is optional for microcontrollers with a non-multiplexed bus.
***This configuration is for 68C812A4_EC at 5MHz, 3V only.
9.3.1. PSD4000 Interface to a Multiplexed Bus
Figure 16 shows an example of a system using a microcontroller with a 16-bit multiplexed
bus and a PSD4000. The ADIO port on the PSD4000 is connected directly to the
microcontroller address/data bus. ALE latches the address lines internally. Latched
addresses can be brought out to Port E, F or G. The PSD4000 drives the ADIO data bus
only when one of its internal resources is accessed and the RD input is active. Should the
system address bus exceed sixteen bits, Ports A, B, C, or F may be used as additional
address inputs.
9.3.2. PSD4000 Interface to a Non-Multiplexed Bus
Figure 17 shows an example of a system using a microcontroller with a 16-bit
non-multiplexed bus and a PSD4000. The address bus is connected to the ADIO Port, and
the data bus is connected to Port F and G. Port F and G are in tri-state mode when the
PSD4000 is not accessed by the microcontroller. Should the system address bus exceed
sixteen bits, Ports A, B or C may be used for additional address inputs.
36
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