ST7FLCD1 datasheet(74/95 Pages) STMICROELECTRONICS

74 / 95 page

Display Data Channel Interfaces (DDC)

ST7FLCD1

74/95

NACK or STOP condition met in Read mode.

Bit 4 = ENDCE End of Communication interrupt Enable.

This bit is set and cleared by software.

End of Communication interrupt disabled.

End of Communication interrupt enabled.

Bit 3 = EDF End of Download interrupt Flag.

This bit is set by hardware. An interrupt is generated if EDE = 1. It must be cleared by software.

Download not started or not completed yet.

Download completed. Last byte of data structure (relative address 7Fh or FFh) has been stored

or read in RAM.

In Read Mode: EDF is set upon reading the next byte after the internal address counter has rolled

over from 7Fh to 00h, or FFh to 80h.

In Write Mode: EDF is set when the last byte of data structure has been stored in RAM, and only if

writing to the RAM is enabled (bit WP = 0). if writing occurs but WP=1, EDF is not set.

Bit 2 = EDE End of Download interrupt Enable.

This bit is set and cleared by software.

End of Download interrupt disabled.

End of Download interrupt enabled.

Bit 1 = WP Write Protect.

This bit is set and cleared by software.

Enable writes to the RAM.

Disable DMA write transfers and protect the RAM content.

CPU writes to the RAM are not affected.

Bit 0 = DDC2BPE DDC2B Peripheral Enable.

This bit is set and cleared by software.

Release the SDA port pin and ignore SCL port pin. The other bits of the DCR are left un-

changed.

Enable the DDC Interface and respond to the DDC2B protocol.

Note:

When DDC2BPE = 1, all the bits of the DCR register are locked and cannot be changed. The

desired configuration therefore must be written in the DCR register with DDC2BPE = 0 and then set

the DDC2BPE bit in a second step.

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