MICRF600Z datasheet(11/21 Pages) MICREL

11 / 21 page

Micrel, Inc.

MICRF600/MICRF600Z

July 2006

M9999-082505

Power on Reset

When applying voltage to the MICRF600 a power on reset

state is entered. During the time period of power on reset,

the MICRF600 should be considered to be in an unknown

state and the user should wait until completed (See Table

6). The power on reset timing given in table 6 is covering

all conditions and should be treated as a maximum delay

time. In some application it might be beneficial to minimize

the power on reset time. In these cases we recommend to

follow below procedure:

Programming Summary

•

Use CS, SCLK, and IO to get access to the control

registers in MICRF600.

•

SCLK is user-controlled.

•

Write to the MICRF600 at positive edges

(MICRF600 reads at negative edges).

•

Read from the MICRF600 at negative edges

(MICRF600 writes at positive edges)

•

After power-on: Write to the complete set of

control registers.

•

Address field is 7 bits long. Enter msb first.

•

R/W bit is 1 bit long (“1” for read, “0” for write)

•

Address and R/W bit together make 1 octet

•

All control registers are 8 bits long. Enter/read msb

in every octet first.

•

Always write 8 bits to/read 8 bits from a control

than 8 used programming bits as well.

•

Writing: Bring CS high, write address and R/W bit

followed by the new values to fill into the

addressed control register(s) and bring CS low for

loading, i.e., activation of the new control register

values.

•

Reading: Bring CS high, write address and R/W

bit, set IO as an input, read present contents of the

addressed control register(s), bring CS low and

set IO an output.

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