MAC7200 datasheet(488/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

410

Freescale Semiconductor

The regulator is a linear regulator with a bandgap reference when operated in Full Performance Mode. It

acts as a voltage clamp in Reduced Power Mode. All load currents flow from input VDDR to VSS or

VSSPLL. The reference circuits are supplied by VDDA and VSSA.

22.4.2.1

Full Performance Mode

In Full Performance Mode the output voltage is compared with a reference voltage by an operational

amplifier. The amplified input voltage difference drives the gate of an output transistor.

22.4.3

POR - Power-On Reset

This functional block monitors VDD15. If VDD15 is below VPORD, POR is asserted, if VDD15 exceeds

VPORD, the POR is de-asserted. POR asserted forces the MCU into Reset. POR De-asserted will trigger

the power on sequence.

22.4.4

LVR15 - Low Voltage Reset

Block LVR monitors the primary output voltage VDD15. If it drops below the assertion level (VLVR15A),

signal LVR15 asserts. If VDD15 rises above the de-assertion level (VLVR15D), signal LVR15 de-asserts.

The LVR function is available only in Full Performance Mode.

22.4.5

LVR33 - Low Voltage Reset

Block LVR monitors the primary output voltage VDD33. If it drops below the assertion level (VLVR33A),

signal LVR33 asserts. If VDD33rises above the de-assertion level (VLVR33D), signal LVR33 de-asserts.

The LVR function is available only in Full Performance Mode.

22.4.6

LVRPLL - Low Voltage Reset

Block LVR monitors the primary output voltage VDDPLL. If it drops below the assertion level

(VLVRPLLA), signal LVRPLL asserts. If VDDPLL rises above the de-assertion level (VLVRPLLD), signal

LVRPLL de-asserts. The LVR function is available only in Full Performance Mode.

22.4.7

Resets

22.4.7.1

General

This section describes how VREG_HIP7A controls the reset of the MCU. Possible reset sources are listed

in Table 22-2.

Table 22-2. VREG_HIP7A - Reset Sources

Reset Source

Local Enable

Power-on Reset (POR)

Always active

Low Voltage Reset (LVR)

Available only in Full

Performance Mode

MAC7200 Datasheet(PDF) 488 Page - Freescale Semiconductor, Inc

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