UPSD3253 datasheet(82/176 Pages) STMICROELECTRONICS

Part #	UPSD3253

Description	Flash Programmable System Devices with 8032 Microcontroller Core and 256Kbit SRAM

PDF	176 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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µPSD325X DEVICES

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Master receiver mode flow.

1. Read SxSTA.

2. If BBUSY == 1 then

go to step1.

Else then

write slave address to SxDAT and set both

ENI1 and STA, reset AA in SxCON.

3. Wait for interrupt.

4. Read SxSTA.

If BLOST == 1 or /ACK_REP == 1 then

write dummy data to SxDAT

Go to step1.

Else then

clear STA and write FFH to SxDAT.

Set AA in SxCON.

5. Wait for interrupt.

6. Read SxSTA.

If this datum == LAST then

reset AA* and read SxDAT**.

Go to step7.

Else then

read SxDAT**.

Go to step5.

7. Wait for interrupt.

Read SxSTA.

Read SxDAT**.

Note: 1. (*) If the master want to terminate the current data re-

quests, it don’t have to acknowledge to the slave.

2. (**) This action should be the last.

Slave transmitter mode.

1. Write slave address to SxADR, set AA and ENI

in SxCON.

2. Wait for interrupt.

3. Read SxSTA and write FFH to SxDAT*.

5. Wait for interrupt.

6. Read SxSTA.

If STOP == 1 then

Go to step7.

Else then

read data from SxDAT*.

Go to step5.

7. Read dummy data from SxDAT*.

Note: 1. (*) This action should be the last.

UPSD3253 Datasheet(PDF) 82 Page - STMicroelectronics

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