| 전자부품 데이터시트 검색엔진 |
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PIC12F635E/P 데이터시트(PDF) 104 Page - Microchip Technology |
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PIC12F635E/P 데이터시트(HTML) 104 Page - Microchip Technology |
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104 / 196 page ![]() PIC12F635/PIC16F636/639 DS41232B-page 102 Preliminary © 2005 Microchip Technology Inc. FIGURE 11-18: SPI READ SEQUENCE CS LFDATA/RSSI/ CCLK/SDIO TSU THD TSCCS THI TLO 1/FSCLK TCS1 TCSH TCS0 SDI (input) SCLK (input) ALERT (output) LFDATA (output) 16 Clocks for Read Command, TCSSC TCSSC TCS1 TCSH TCS0 SDO SCLK (input) ALERT (output) LFDATA (output) 16 Clocks for Read Result (output) SCLK/ALERT ALERT LFDATA (output) (output) 1 2 3 4 5 6 7 8 9 10 TDO MSb LSb TCSSC Address and Dummy Data MCU SPI Read 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 Read sequence. • Command, address and dummy data. 5. Change LFDATA/RSSI/CCLK/SDIO connected pin to input. 6. Raise CS to complete the SPI Read entry of command and address. 7. Drop CS. • AFE SCLK/ALERT becomes SCLK input. • LFDATA/RSSI/CCLK/SDIO becomes SDO output. 8. Clock out 16-bit SPI Read result. • First seven bits clocked-out are dummy bits. • Next eight bits are the Configuration register data. • The last bit is the Configuration register row parity bit. 9. Raise CS to complete the SPI Read. 10. Change SCLK/ALERT back to input. Note: The TCSH is considered as one clock. Therefore, the Configuration register data appears at 6th clock after TCSH. |
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