PSD413A2 datasheet(45/123 Pages) STMICROELECTRONICS

Part #	PSD413A2

Description	Low Cost Field Programmable Microcontroller Peripherals

PDF	123 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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45 / 123 page

PSD4XX Family

Table 7. 8-Bit Data Bus

Table 8. 16-Bit Data Bus With BHE

WRH

WRL

D15 – D8

D7 – D0

Odd byte

Even byte

Odd byte

–

Even byte

Table 9. 16-Bit Data Bus With WRH and WRL

SIZ0

D15 – D8

D7 – D0

Even byte

Odd byte

Even byte

–

Odd byte

Table 10. 16-Bit Data Bus With SIZ0, A0

LDS

UDS

D15 – D8

D7 – D0

Even byte

Odd byte

Even byte

–

Odd byte

Table 11. 16-Bit Data Bus With UDS, LDS

9.2.4 Data Byte Enable

Microcontrollers have different data byte orientations with regard to the data bus. The

following tables show how the PSD4XX handles the byte enable under different bus

configurations. Even byte refers to locations with address A0 equal to “0”, and odd byte as

locations with A0 equal to “1”.

BHE

D15 – D8

D7 – D0

Odd byte

Even byte

Odd byte

–

Even byte

BHE

D7 – D0

Even Byte

Odd Byte

The PSD4XX

Architecture

(cont.)

PSD413A2 Datasheet(PDF) 45 Page - STMicroelectronics

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