User Manual

8 MC13192 Product Preview MOTOROLA
Functional Description
5 Functional Description
5.1 MC13192 Operational States
The MC13192 has a number of operational states that allow for low-current operation. Entry from the Off
to Idle state occurs when RST
is de-asserted. Once in Idle, the SPI is active and controls the IC. Transition
to Off, Hibernate, and Doze is controlled through the SPI. These states are summarized, along with the
transition times, in Table 6. Current drain in the various states is listed in Table 3, DC Electrical
Characteristics.
Table 6. MC13192 Mode Definitions and Transition Times
Mode Definition
Transition Time
To or From Idle
Off All IC functions Off, Leakage only. RST asserted. 23.332 ms to Idle
Hibernate Crystal Reference Oscillator Off. (SPI not functional.) IC Responds to
ATTN
.
18.332 ms to Idle
Doze Crystal Reference Oscillator On but CLKO output available only if
Register 7, Bit 9 = 1 for frequencies of 1 MHz or less. (SPI not
functional.) Responds to ATTN and can be programmed to enter Idle
State through an internal timer comparator.
332 µs to Idle
Idle Crystal Reference Oscillator On with CLKO output available. SPI active.
Receive Crystal Reference Oscillator On. Receiver On. SPI should not be
accessed.
144 µs from Idle
Transmit Crystal Reference Oscillator On. Transmitter On. SPI should not be
accessed.
144 µs from Idle
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