MAXQ7667AACM/V+T【PDF 14/40 页】IC MCU-BASED DAS 16BIT 48-LQFP

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MAXQ7667

16-Bit, RISC, Microcontroller-Based,

Ultrasonic Distance-Measuring System

______________________________________________________________________________________

MAXQ is a registered trademark of Maxim Integrated Products, Inc.

Type 2 Timers/Counters

The MAXQ7667 includes three 16-bit timers/counters

with programmable I/O (Figure 9). Each timer is a Type

2 timer implemented in the MAXQ family. The Type 2

timer is an autoreload 16-bit timer/counter offering the

following functions:

8-bit/16-bit timer/counter

Up/down autoreload

Counter function of external pulse

Capture

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Clock Sources

The MAXQ7667 oscillator module supplies the system

clock for the C core and all of the peripheral modules.

The high-frequency oscillator operates with a 1MHz to

16MHz crystal. Use the internal RC oscillator as the

system clock for applications that do not require pre-

cise timing. See Section 15 of the

MAXQ7667 User’s

Guide.

The MAXQ7667 supports the following master clock

sources:

Internal high-frequency oscillator drives an exter-

nal 1MHz–16MHz crystal or ceramic resonator

Internal, fast-starting, 13.5MHz RC oscillator

(default oscillator at startup and in the event the

external crystal fails)

External 4MHz–16MHz clock input

Crystal Selection

The MAXQ7667 requires a crystal with the following

specifications:

Frequency: 1MHz–16MHz

CLOAD: 6pF (min)

Drive level: 5W

Series resonance resistance: 30

(max)

Note: Quartz crystal vendors often specify series reso-

nance resistance (R1). Series resonance resistance is

the resistance observed when the resonator is in the

series resonant condition. When a resonator is used in

the parallel resonant mode with an external load capac-

itance, as is the case with the MAXQ7667 oscillator cir-

cuit, the effective resistance at the loaded frequency of

oscillation is:

R1 x (1 + (CO/CLOAD))2

For typical shunt capacitance (CO) and load capaci-

tance (CLOAD) values, the effective resistance poten-

tially exceeds R1 by a factor of 2.

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