PSD4246F3V-70UT 데이터 시트보기 (PDF) - STMicroelectronics

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PSD4246F3V-70UT

Flash In-System Programmable (ISP) Peripherals For 16-bit MCUs (5V Supply)

STMicroelectronics 

PSD4235G2

Data Byte Enable Reference. MCUs have differ-

ent data byte orientations. Table 35 to Table 38

show how the PSD4235G2 interprets 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

BHE

A0

D15-D8

D7-D0

0

0 Odd Byte

Even Byte

0

1 Odd Byte

—

1

0—

Even Byte

MCU Bus Interface Examples. Figure 21 to Fig-

ure 26 show examples of the basic connections

between the PSD4235G2 and some popular

MCUs. The PSD4235G2 Control input pins are la-

beled as to the MCU function for which they are

configured. The MCU bus interface is specified us-

ing PSDsoft Express. The Voltage Stand-by (VST-

BY, PE6) line should be held at Ground if not in

use.

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

WRH WRL

D15-D8

D7-D0

0

0 Odd Byte

Even Byte

0

1 Odd Byte

—

1

0—

Even Byte

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

(Motorola MCU)

SIZ0

A0

D15-D8

D7-D0

0

0 Even Byte

Odd Byte

1

0 Even Byte

—

1

1—

Odd Byte

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

(Motorola MCU)

WRH WRL

D15-D8

D7-D0

0

0 Even Byte

Odd Byte

1

0 Even Byte

—

0

1—

Odd Byte

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