AD7476/AD7477/AD7478
Rev. F | Page 20 of 24
01
024
-02
8
SRD
SDATA
AD7476/
AD7477/
AD74781
DSP56xxx1
SCLK
SCK
CS
SC2
1ADDITIONAL PINS OMITTED FOR CLARITY
01
024
-02
9
MISO/PMC0
SDATA
AD7476/
AD7477/
AD74781
MC68HC161
SCLK
SCLK/PMC2
CS
SS/PMC9
1ADDITIONAL PINS OMITTED FOR CLARITY
Figure 28. Interfacing to the DSP56xxx
Figure 29. Interfacing to the MC68HC16
AD7476/AD7477/AD7478 to MC68HC16 Interface
The serial transfer takes place as a 16-bit operation when the
SIZE bit in the SPCR register is set to SIZE = 1. To implement
the power-down mode with an 8-bit transfer, set SIZE = 0.
The serial peripheral interface (SPI) on the MC68HC16 is
configured for master mode (MSTR = 1), the clock polarity bit
(CPOL) = 1, and the clock phase bit (CPHA) = 0. The SPI is
configured by writing to the SPI Control Register (SPCR). For
more information on the MC68HC16, check with Motorola for
the related documentation.