AT86RF211DAI-R datasheet(24/48 Pages) ATMEL

24 / 48 page

AT86RF211

1942C–WIRE–06/02

Only the 2 MSBs are updated on the rising edge of SLE; other register bits are

unchanged.

• READ Mode (R/W = 0)

The address and R/W bits are clocked on the rising edge of SCK.

The data bits are changed on the falling edge of SCK. The MSB of the register is the first

bit read.

SDATA I/O pin is switched from input to output on the edge following the "1" clocking the

R/W bit.

It is possible to stop reading a register (SLE back to “1”)at any time.

If an attempt to read more bits than the register capacity is detected, SDATA is clamped

to “0”.

If the address of a register is not valid, SDATA is set to “1” during the first 32 SCK peri-

ods, then to “0” during all the extra periods.

SDATA is switched back to the input state when SLE is back to “1”.

Figure 31. Read Chronogram: Complete Read Cycle from a 10 bits Register

Figure 32. Read chronogram: Partial Read Cycle, Reading 2 bits

A[0]

D[9 ]

D[8]

A[1]

A[2 ]

D[7]

A[3]

R/W

SLE

SCK

SDATA

D[6]

D[5]

D[4]

D[3]

D[2]

D[1]

D[0]

INPUT

OUTPUT

INPUT

SDATA

direction

A[0]

D[31]

A[1]

A[2]

A[3]

R/W

SLE

SCK

SDATA

mode

INPUT

D[30]

OUTPUT

INPUT

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