PIC16F636T-I/SL(2005) View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F636T-I/SL
(Rev.:2005)

8/14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC12F635/PIC16F636/639

FIGURE 11-17: SPI WRITE SEQUENCE

2

CS

TCSH

6

SCLK/

ALERT

ALERT

(output)

1

TCSSC

4 16 Clocks for Write Command, Address and Data

THI TLO

TSCCS TCS1

7

TCS0

SCLK

(input)

MSb

TSU THD

1/FSCLK

LSb

ALERT

(output)

LFDATA/RSSI/

CCLK/SDIO

LFDATA

(output)

SDI

(input)

3

LFDATA

5

(output)

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.

© 2005 Microchip Technology Inc.

Preliminary

DS41232B-page 101

Share Link: