AT89LP2052 datasheet(60/90 Pages) ATMEL

60 / 90 page

3547F–MICRO–6/06

AT89LP2052/LP4052

22.4.5

Load Code Page Buffer

Function:

• Loads 1 page (1 to 32 bytes) of data into the temporary page buffer but does not start

programming.

• Use for interruptible loads or loading non-contiguous bytes to a page.

• The byte address (offset in page) is initialized to bits [4:0] of the low address byte. One byte

of data is loaded from P1 for the current address by the positive edge of a XTAL1 pulse. The

internal address is incremented by one on the negative edge of the XTAL1 pulse. The

address will wrap around to the 1st byte of the page when incremented past 31, however

previously loaded bytes should not be re-loaded.

• The Load Page Buffer command needs to be followed by a write command as the internal

buffer is not cleared until either the next write has completed or the programming session

ends.

• Clears Bit 3 of the status byte to signal that the buffer contains data.

Usage:

Bring CS (P3.2) low.

Drive P1 to AAh and pulse XTAL1 high.

Drive P1 to 51h and pulse XTAL1 high.

Drive P1 to 00h and pulse XTAL1 high.

Drive P1 with bits [4:0] of address and pulse XTAL1 high.

To load data bytes, drive data on P1 and pulse XTAL1 high to load one byte and incre-

ment to the next address. Repeat for additional bytes. Only 1-32 bytes may be

programmed at one time, including any bytes loaded by a previous load page buffer

command. Bytes should not be loaded more than once.

Bring CS high.

Figure 22-9. Load Page Buffer Sequence

Note:

The waveform on this page is not to scale.

AAh

51h

00h

000bbbbb

DIN 0

XTAL1

DIN 1

DIN n

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