Cirrus Logic CRD5376 - Manual (Page 24)

CRD5376
24 DS612RD2
Many connections to the C8051F320 microcontroller are inactive by default, but are provided for conve-
nience during custom reprogramming. Listed below are the default active connections to the microcon-
troller and how they are used.
2.3.2.1 SPI Interface
The microcontroller SPI interface communicates with the CS5376A digital filter to write/read configuration
information from the SPI 1 port and collect conversion data from the SD port. Detailed information about
interfacing to the digital filter SPI 1 and SD ports can be found in the CS5376A data sheet.
2.3.2.2 USB Interface
The microcontroller USB interface communicates with the PC evaluation software to receive configuration
commands and return collected conversion data. The USB interface uses the Silicon Laboratories API
and Windows drivers, which are available free from the internet (
http://www.silabs.com ).
2.3.2.3 Reset Source
By default, the C8051F320 microcontroller receives its reset signal from the internal power-on reset. This
reset signal is also output to the CS5376A digital filter.
2.3.2.4 Clock Source
By default, the C8051F320 microcontroller uses an internally generated 12 MHz clock for compatibility
with USB standards.
Pin # Pin Name Assignment Description
17
P2.1 TIMEB Time Break signal to CS5376A
18 P2.0 SYNC SYNC signal to CS5376A
19 P1.7 BYP_EN I2C bypass switch control
20 P1.6 SDA_DE I2C data driver enable
21 P1.5 SCL I2C clock in/out
22 P1.4 SDA I2C data in/out
23 P1.3 SSIz SPI chip select output, active low
24 P1.2 MOSI SPI master out / slave in
Pin # Pin Name Assignment Assignment
25
P1.1 MISO SPI master in / slave out
26 P1.0 SCK1 SPI serial clock
27 P0.7 Internal VREF bypass capacitors
28 P0.6 SINTz Serial acknowledge from CS5376A, active low
29 P0.5 RX UART receiver
30 P0.4 TX UART transmitter
31 P0.3 4.096MHZ External clock input
32 P0.2 SDRDYz Data ready acknowledge from CS5376A, active low