PIC12F635-E/MD MICROCHIP [Microchip Technology], PIC12F635-E/MD Datasheet - Page 121

• Manufacturer Part Number: PIC12F635-E/MD
• Description: 8/14-Pin, Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 11-17:
© 2007 Microchip Technology Inc.
LFDATA/RSSI/
MCU SPI Write Details:
1.
2.
3.
4.
5.
6.
7.
CCLK/SDIO
ALERT
SCLK/
Drive the AFE’s open collector ALERT output low.
•
Drop CS.
•
•
Change LFDATA/RSSI/CCLK/SDIO connected pin to output.
•
Clock in 16-bit SPI Write sequence - command, address, data and parity bit.
•
Change LFDATA/RSSI/CCLK/SDIO connected pin to input.
Raise CS to complete the SPI Write.
Change SCLK/ALERT back to input.
CS
To ensure no false clocks occur when CS drops.
AFE SCLK/ALERT becomes SCLK input.
LFDATA/RSSI/CCLK/SDIO becomes SDI input.
Driving SPI data.
Command, address, data and parity bit.
(output)
ALERT
LFDATA
(output)
1
SPI WRITE SEQUENCE
(input)
2
SCLK
(input)
T
CSSC
SDI
T
3
SU
MSb
T
HD
4
16 Clocks for Write Command, Address and Data
PIC12F635/PIC16F636/639
T
HI
1/F
SCLK
T
LO
LSb
T
SCCS
5
6
T
LFDATA
(output)
CS
1
(output)
DS41232D-page 119
ALERT
T
7
CSH
T
CS
0