Rainbow Electronics MAXQ7670 - Manual (Page 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%.
C
LOAD
: 12pF.
C O : < 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 O /C LOAD ))2
For typical C O 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) REGISTER
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