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PIC12F635ESS датащи(PDF) 121 Page - Microchip Technology

номер детали PIC12F635ESS
подробное описание детали  PIC12F635/PIC16F636/639 Data Sheet
PDF  234 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC12F635ESS датащи(HTML) 121 Page - Microchip Technology

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© 2007 Microchip Technology Inc.
DS41232D-page 119
PIC12F635/PIC16F636/639
FIGURE 11-17:
SPI WRITE SEQUENCE
CS
SCLK/
LFDATA/RSSI/
TSU
THD
TCSSC
TSCCS
THI
TLO
1/FSCLK
TCS1
TCSH
TCS0
CCLK/SDIO
ALERT
LFDATA
SDI
(output)
(input)
(output)
SCLK
(input)
ALERT
(output)
LFDATA
(output)
16 Clocks for Write Command, Address and Data
ALERT
1
2
3
4
5
6
7
MCU SPI Write Details:
1.
Drive the AFE’s open collector ALERT output low.
•
To ensure no false clocks occur when CS drops.
2.
Drop CS.
•AFE SCLK/ALERT becomes SCLK input.
•
LFDATA/RSSI/CCLK/SDIO becomes SDI input.
3.
Change LFDATA/RSSI/CCLK/SDIO connected pin to output.
•
Driving SPI data.
4.
Clock in 16-bit SPI Write sequence - command, address, data and parity bit.
•
Command, address, data and parity bit.
5.
Change LFDATA/RSSI/CCLK/SDIO connected pin to input.
6.
Raise CS to complete the SPI Write.
7.
Change SCLK/ALERT back to input.
LSb
MSb



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