MAXQ7667AACM/V+T【PDF 19/40 页】IC MCU-BASED DAS 16BIT 48-LQFP

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MAXQ7667

16-Bit, RISC, Microcontroller-Based,

Ultrasonic Distance-Measuring System

______________________________________________________________________________________

Connect bypass capacitors at each power-supply input

as close as possible to the device. Use a bypass

capacitor less than 0.47F on DVDDIO. For most appli-

cations, 0.1F bypass capacitors are adequate.

Supply Brownout Monitor

Power supplies DVDD, AVDD, and DVDDIO each

include a brownout monitor/supervisor that alerts the

C when their corresponding supply voltages drop

below the interrupt threshold. Activate each brownout

monitor independently using the corresponding

brownout enable bits: VDBE, VIBE, and VABE.

Reset

In reset mode, no instruction execution occurs and all

inputs/outputs return to their default states. Code exe-

cution resumes at address 8000h (in the utility ROM)

once the reset condition is removed.

Four different sources reset the MAXQ7667: POR,

watchdog timer reset, external reset, and internal sys-

tem reset.

During normal operation, force

RESET low for at least

four system clock cycles for an external reset. Set the

ROD bit in the SC register, while the SPE bit in the ICDF

16 of the

MAXQ7667 User’s Guide.

Power-On Reset (POR)

The MAXQ7667 includes a DVDD voltage supervisor to

control the C POR. On power-up, internal circuitry

pulls

RESET low and resets all the internal registers.

RESET is held low for the duration of the power-on

delay after VDVDD rises above the DVDD reset thresh-

old. The internal RC oscillator starts up and software

execution begins at the reset vector location 8000h

immediately after the device exits POR while

RESET is

I/O PAD

DVDDIO

P0._

100

DGND

EIE0._

EIES0._

DETECT

CIRCUIT

INTERRUPT

FLAG

PS0._

PR0._

PD0._

PO0._

SF DIRECTION

SF ENABLE

SF OUTPUT

PI0._ OR

SF INPUT

FLAG

MUX

MAXQ7667

Figure 13. Port 0 Digital I/O Basic Circuitry. Port 1 Circuitry is the Same as Port 2.

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