L6260 datasheet(18/30 Pages) STMICROELECTRONICS

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The read cycle is initiated by setting SLOAD low

and clocking in a valid read address. Only four

bits of address are necessary, if more than four

bits are clocked in, the four MSBs will be ignored

(i.e. only the first four bits will be used). If a valid

address is detected, the rising edge of R/W will

load the desired register into the internal se-

rial/parallel register ready for clocking out. The

data in the serial/parallel register is then serially

clocked out on every rising edge of SCLK (LSB is

clocked out first). Additional padded bits clocked

out will be zero.

Note: If SLOAD is set low with R/W high, the cur-

rent contents of the internal shift register can be

clocked out. This is useful for a ”read back” of the

data last written into the required register.

D94IN094

tPER

D10

D11

SCLK

4 bit address (FIXED)

12 bit data (FIXED)

tRWS

tSLS

SLOAD

R/W

tRWH

tSLH

SDIO

Figure 5: Serial Write Timing Diagram

The write cycle has a fixed address and data

length. Four bits of address and 12 bits of data

must be clocked in to allow the data to be loaded

into the desired register. The write cycle is initi-

ated by setting SLOAD and R/W low. Setting R/W

low causes the SDIO line to be tri-stated for data

input. SLOAD low enables the internal counter to

increment on the rising edge of SCLK. The ad-

dress and data are clocked into the chip serially

on each rising edge of SCLK as shown above.

When both the 4 bits of address and the 12 bits of

the data have been clocked in, then the ad-

dressed register will be written to with the pro-

vided data. Setting SLOAD high will clear the in-

ternal logic and tri-state the SDIO line. This also

provides a way of safely aborting a write by sim-

ply forcing SLOAD high. NOTE: SLOAD must be

kept low during the entire duration of the 16 write

clocks.

D94IN095

tPER

D10

D11

SCLK

INPUT

OUTPUT

SLOAD

R/W

tRWS

tSLS

SDIO

tRWD

DATA

INVALID

HiZ

tSCKD

Figure 6: Serial Read Timing Diagram

L6260

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