PSD4235G2V-10UI datasheet(50/100 Pages) STMICROELECTRONICS

50 / 100 page

PSD4256G6V

50/100

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

Data Byte Enable Reference for a 16-bit Bus

MCUs have different data byte orientations. Table

35 to Table 38 show how the PSD4256G6V inter-

prets byte/word operations in different 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 35. 16-Bit Data Bus with BHE

16-bit MCU Bus Interface Examples

Figure 21, page 51 to Figure 26, page 57 show ex-

amples of the basic connections between the

PSD4256G6V and some popular MCUs. The

PSD4256G6V Control input pins are labeled as to

the MCU function for which they are configured.

The MCU bus interface is specified using PSDsoft.

The Voltage Standby (VSTBY, PE6) line should be

held at Ground if not in use.

Table 36. 16-Bit Data Bus with WRH and WRL

Table 37. 16-Bit Data Bus with SIZ0, A0

(Motorola MCU)

Table 38. 16-Bit Data Bus with LDS, UDS

(Motorola MCU)

BHE

D15-D8

D7-D0

Odd Byte

Even Byte

Odd Byte

—

Even Byte

WRH

WRL

D15-D8

D7-D0

Odd Byte

Even Byte

Odd Byte

—

Even Byte

SIZ0

D15-D8

D7-D0

Even Byte

Odd Byte

Even Byte

—

Odd Byte

WRH

WRL

D15-D8

D7-D0

Even Byte

Odd Byte

Even Byte

—

Odd Byte

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