Maxim-integrated MAXQ622 Bedienungsanleitung PDF herunterladen (Seite 155)

MAXQ612/MAXQ622 User’s Guide

10-8 Maxim Integrated

10.8.3 SPI Clock Register (SPICKn)

Bits 7:0: Clock Divider Ratio Bits 7:0 (CKR[7:0]). This 8-bit value determines the system clock divide ratio to be

used for SPI master mode baud-clock generation. This register has no function when operating in slave mode as the

SPI clock generation circuitry is disabled. The frequency of the SPI master-mode baud rate is calculated using the

following equation:

SPI Baud Rate = (0.5 x System Clock Frequency)/(CKR[7:0] + 1)

10.8.4 SPI Data Buffer Register (SPIBn)

Data for SPI is read from or written to this location. The serial transmit and receive buffers are separate, but both are

addressed at this location. Write access is allowed only outside the transfer cycle. When the STBY bit is set, write

attempts are blocked and cause a write collision error.

7 0

SPI Clock Register (SPICKn)

Power-On Reset and System Resets

Read (r), Write (w), or Special (s) access

15 0

SPI Data Buffer Register (SPIBn)

Power-On Reset and System Resets

Read (r), Write (w), or Special (s) access

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Maxim-integrated MAXQ622 Bedienungsanleitung Seite 155