Figure 3-21. Second TWI Interface
TWI Bus Distribution
22R
0402 1%
R90
22R
0402 1%
R96
EEPROM1_TWD
EEPROM1_TWCK
22R
0402 1%
R92
22R
0402 1%
R97
EEPROM2_TWD
EEPROM2_TWCK
FLEXCOM8_IO0_PC14
FLEXCOM8_IO1_PC13
22R
0402 1%
R85
22R
0402 1%
R87
22R
0402 1%
R94
22R
0402 1%
R95
VDD_3V3
CAM_TWCK
CAM_TWD
ECC608_TWD
ECC608_TWCK
2.2k
0402
1%
R91
2.2k
0402
1%
R89
The third interface is used to access any device placed on one of the following:
• mikroBUS 1 connector
• mikroBUS 2 connector
• RPi 40-pin connector
Figure 3-22. Third TWI Interface
TWI Bus Distribution
MIKROBUS1_TWD_PC18
MIKROBUS1_TWCK_PC19
22R
0402 1%
R59
22R
0402 1%
R75
FLEXCOM9_IO0_PC18
FLEXCOM9_IO1_PC19
MIKROBUS2_TWD_PC18
22R
0402 1%
R62
EXT40_TWCK_PC19
22R
0402 1%
R78
EXT40_TWD_PC18
MIKROBUS2_TWCK_PC19
22R
0402 1%
R68
22R
0402 1%
R80
VDD_3V3
2.2k
0402
1%
R70
2.2k
0402
1%
R66
3.2.5.6.2 SPI Bus Distribution
The SAMA7G54-EK features two dedicated SPIs to access the on-board devices.
The Serial Peripheral Interface (SPI) circuit is a synchronous serial data link that provides communication with
external devices in Host or Client mode. It also enables communication between processors if an external processor
is connected to the system.
The SPI system consists of two data lines and two control lines:
• Host Out Client In (MOSI)—This data line supplies the output data from the host shifted into the input(s) of the
client(s).
• Host In Client Out (MISO)—This data line supplies the output data from a client to the input of the host. There
may be no more than one client transmitting data during any particular transfer.
• Serial Clock (SPCK)—This control line is driven by the host and regulates the flow of the data bits. The host can
transmit data at a variety of baud rates; there is one SPCK pulse for each bit that is transmitted.
• Client Select (NSS)—This control line allows clients to be turned on and off by hardware.
The first interface is used to access the following devices:
• Any device placed on the mikroBUS 1 connector. Flexcom11 in SPI mode is used to address this interface. Chip
Select 0 is used to select the device available in this interface.
• Any device placed on the mikroBUS 2 connector. Flexcom11 in SPI mode is used to address this interface. Chip
Select 1 is used to select the device available in this interface.
SAMA7G54-EK
Function Blocks
©
2022 Microchip Technology Inc.
and its subsidiaries
User Guide
DS50003273A-page 31
