MC33596 datasheet(39/58 Pages) FREESCALE

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Controller

MC33596 Data Sheet, Rev. 3

Freescale Semiconductor

output data are complemented also. When an EOM occurs before the current byte is fully shifted out,

dummy bits are inserted until the number of shifted bits is a multiple of 8.

For all states: At any time, a low level applied to STROBE puts the circuit into state 20, and a low level

applied to CONFB forces the state machine to state 1.

17.3 Standby/LVD Mode

Standby/LVD mode allows minimum current consumption to be achieved. Depending upon the value of

the LVDE bit, the circuit is in standby mode (state 60) or LVD mode (state 5 and 20).

LVDE = 0: The receiver is in standby; consumption is reduced to leakage current (current state after POR).

LVDE = 1: The LVD function is enabled; consumption is in the range of tens of microamperes.

The only way to exit this mode is to go back to configuration mode by applying a low level to CONFB.

17.4 Transition Time

Table 21 details the different times that must be considered for a given transition in the state machine, once

the logic conditions for that transition are met.

Table 21. Transition Time Definition

Transition

State x -> y

Crystal

Oscillator

Startup Time,

Parameter 5.10

PLL Timing

Receiver

Preamble

Time1

NOTES:

See Section 11.2, “Preamble, Identifier, Header, and Message.”

Receiver

On-to-Off Time,

Parameter 1.12

Standby to SPI running, state 60 -> 1

√

Standby to receiver running, states 5 -> 5b, 20 -> 21

√

Lock time parameter

5.9

√

Off to receiver running, states 0 -> 0b, 10 -> 11

√

Lock time parameter

5.9

√

Configuration to receiver running,

states 1 -> (0b, 5b, 11, 21)

0 or lock time

parameter 5.1 or lock

time parameter 5.9 2

Depending on the PLL status before entering configuration mode. For example, the transition time from standby to receiver

running (FSK modulation, 19.2 kBd, AFFC = 0, data manager enabled) is: 0.6 ms + 50 µs + (3 + 1)/19.2k = 970 µs.

√

Receiver running to configuration mode,

state (0b, 5b, 11, 12, 13, 21, 22, 23) -> 1,

Receiver running to standby mode,

state 5b -> 5, (21, 22, 23) -> 20

√

Receiver running to off mode,

state 0b -> 0, (11, 12, 13) -> 10

√

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