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AD7887ARM датащи(PDF) 19 Page - Analog Devices

номер детали AD7887ARM
подробное описание детали  2.7 V to 5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead MSOP
PDF  24 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD7887ARM датащи(HTML) 19 Page - Analog Devices

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AD7887
Rev. D | Page 19 of 24
DOUT
DIN
SCLK
CS
1ADDITIONAL PINS OMITTED FOR CLARITY.
AD78871
80511
P1.3
P1.0
P1.1
P1.2
AD7887 to MC68HC11
The serial peripheral interface (SPI) on the MC68HC11 is
configured for master mode (MSTR = 1) when the clock
polarity bit (CPOL) = 1 and the clock phase bit (CPHA) = 1.
The SPI is configured by writing to the SPI Control Register
(SPCR)—see the M68HC11 reference manual from Freescale
Semiconductor, Inc., for more information. The serial transfer
takes place as two 8-bit operations. A connection diagram is
shown in Figure 25.
Figure 26. Interfacing to the 8051 Using Input/Output Ports
AD7887 to PIC16C6x/PIC16C7x
DOUT
DIN
SCLK
CS
1ADDITIONAL PINS OMITTED FOR CLARITY.
MC68HC111
AD78871
SCLK/PD4
MISO/PD2
MOSI/PD3
PA0
The PIC16C6x synchronous serial port (SSP) is configured as an
SPI master with the clock polarity bit = 1. This is done by writing to
the synchronous serial port control register (SSPCON). See the
PIC16/PIC17 Microcontroller User Manual. Figure 27 shows the
hardware connections needed to interface to the PIC16C6x/
PIC16C7x. In this example, input/output port RA1 is being used to
pulse CS. This microcontroller only transfers eight bits of data
during each serial transfer operation. Therefore, two consecutive
read/write operations are needed.
Figure 25. Interfacing to the MC68HC11
AD7887 to 8051
DOUT
DIN
SCLK
CS
1ADDITIONAL PINS OMITTED FOR CLARITY.
AD78871
PIC16C6x/
PIC16C7x1
SCK/RC3
SDO/RC5
RA1
SDI/RC4
It is possible to implement a serial interface using the data ports
on the 8051. This allows a full duplex serial transfer to be imple-
mented. The technique involves bit-banging an input/output
port (for example, P1.0) to generate a serial clock and using two
other input/output ports (for example, P1.1 and P1.2) to shift
data in and out—see Figure 26.
Figure 27. Interfacing to the PIC16C6x/PIC16C7x



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