MPC5645S datasheet(8/146 Pages) FREESCALE

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Qorivva MPC5645S Microcontroller Data Sheet, Rev. 8

Freescale Semiconductor

Additional notes on low power operation:

•

Fast wake-up using the on-chip 16 MHz internal RC oscillator allows rapid execution from RAM on exit from low

power modes

•

The 16 MHz internal RC oscillator supports low speed code execution and clocking of peripherals when it is selected

as the system clock and can also be used as the PLL input clock source to provide fast start-up without the external

oscillator delay

•

The device includes an internal voltage regulator that includes the following features:

— Regulates input to generate all internal supplies

— Manages power gating

— External ballast transistor for high power regulator

— Low-Power and Ultra-Low-Power regulators support operation when in STOP and STANDBY modes,

respectively, to minimize power consumption

Table 2. Operating mode summary

SoC features

Clock sources

Wake-up time1

A high level summary of some key durations that need to be considered when recovering from low power modes. This

does not account for all durations at wake up. Other delays will be necessary to consider including, but not limited to the

external supply start-up time.

IRC Wake-up time must not be added to the overall wake-up time as it starts in parallel with the VREG.

All other wake-up times must be added to determine the total start-up time.

RUN

Either 64 KB or 8 KB available.

—

HALT

—

— 30 µs

Flash configured in disabled mode.

STOP

350 µs 4 µs

20 µs

1 ms 200 µs

— 30 µs

STAN

DBY

Off

Off 64K

64 KB of the RAM contents is retained, but not accessible in STANDBY mode.

Off

350 µs 8 µs 100 µs 1 ms 200 µs Var

28 µs

Off

8 KB of the RAM contents is retained, but not accessible in STANDBY mode.

Off

200 µs 8 µs 100 µs 1 ms 200 µs Var

28 µs

POR

—

500 µs 8 µs 100 µs 1 ms 200 µs

—

BAM

Dependent on boot option after reset.

Table key:

• On — Powered and clocked

• OP — Optionally configurable to be enabled or disabled (clock gated)

• CG — Clock Gated, Powered but clock stopped

• Off — Powered off and clock gated

• FP — VREG Full Performance mode

• LP — VREG Low Power mode, reduced output capability of VREG but lower power consumption

• Var — Variable duration, based on the required reconfiguration and execution clock speed

• BAM — Boot Assist Module Software and Hardware used for device start-up and configuration

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