Rainbow-electronics MAXQ7670 Manual de usuario descargar pdf (Pagina 30)

MAXQ7670

Microcontroller with 10-Bit ADC,

PGA, 64KB Flash, and CAN Interface

30 ______________________________________________________________________________________

Crystal Selection

The MAXQ7670 uses an 8MHz or 16MHz Jauch

JXG53P2 (or similar specification):

Frequency: 8MHz or 16MHz ±0.25%.

LOAD

: 12pF.

: < 7pF max.

Series resonance resistance: max 50Ω/300Ω for

16MHz/8MHz, respectively.

Note: Series resonance resistance is the resistance

observed when the resonator is in the series resonant

condition. This is a parameter often stated by quartz

crystal vendors and is called R1. When a resonator is

used in the parallel resonant mode with an external

load capacitance, as is the case with the MAXQ7670

oscillator circuit, the effective resistance is sometimes

stated. This effective resistance at the loaded frequen-

cy of oscillation is:

R1 x (1 + (C

LOAD

))2

For typical C

and C

LOAD

values, the effective resis-

tance can be greater than R1 by a factor of two.

Development and Technical Support

Highly versatile, affordably priced development tools

for this µC are available from Maxim and third-party

suppliers. Tools for the MAXQ7670 include:

• Compilers

• Evaluation kits

• JTAG-to-serial converters for programming and

debugging

A list of development tool vendors can be found at

www.maxim-ic.com/microcontrollers. For technical

support, go to www.maxim-ic.com/support.

MODULE NAME (BASE SPECIFIER)

INDEX

AP (8h) A (9h) PFX (Bh) IP (Ch) SP (Dh) DPC (Eh) DP (Fh)

0h AP A[0] PFX[0] IP ———

1h APC A[1] PFX[1] — SP ——

2h — A[2] PFX[2] — IV ——

3h — A[3] PFX[3] — — OFFS DP0

4h PSF A[4] PFX[4] ——DPC —

5h IC A[5] PFX[5] ——GR —

6h IMR A[6] PFX[6] — LC0 GRL —

7h — A[7] PFX[7] — LC1 BP DP1

8h SC A[8] ——GRS —

9h — A[9] — — — GRH —

Ah — A[10] ———GRXL —

Bh IIR A[11] ———FP —

Ch — A[12] —————

Dh — A[13] —————

Eh CKCN A[14] —————

Fh WDCN A[15] —————

Table 2. System Register Map

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 36 37

MAXQ7670 1

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