Mikrobus ™ Sockets - mikroElektronika EasyAVR v7 User Manual

mikroBUS
Easier connectivity and simple configuration are
imperative in modern electronic devices. Success
of the USB standard comes from it's simplicity of
usage and high and reliable data transfer rates. As
we in mikroElektronika see it, Plug-and-Play devices
with minimum settings are the future in embedded
world too. This is why our engineers have come up
with a simple, but brilliant pinout with lines that
most of today's accessory boards require, which
almost completely eliminates the need of additional
hardware settings. We called this new standard the
mikroBUS . EasyAVR v7 is the first development
™ ™
board in the world to support mikroBUS
three on-board sockets. As you can see, there are
no additional DIP switches, or jumper selections.
Everything is already routed to the most appropriate
pins of the microcontroller sockets.
mikroBUS host connector
™
Each mikroBUS host connector consists of two
™
1x8 female headers containing pins that are most
likely to be used in the target accessory board.
There are three groups of communication pins:
SPI, UART and I C communication. There are also
2
single pins for PWM, Interrupt, Analog input,
Reset and Chip Select. Pinout contains two power
groups: +5V and GND on one header and +3.3V
and GND on the other 1x8 header.
SPI and I C selection
2
Various microcontroller sockets have different pins for
SPI and I C interface. In order to connect the SPI and
2
I C pins of the mikroBUS with the desired socket, you
2 ™
have to change appropriate SW3, SW5 or SW6 DIP
switches to ON position, Figure 8-1.
page 16
sockets
™
with
™
AN
- Analog pin
RST
- Reset pin
CS - SPI Chip Select line
SCK - SPI Clock line
PA7
AN PWM
PA6
RST INT
PA5
CS RX
SCK
SCK TX
MISO
MISO SCL
MOSI
MOSI SDA
1
VCC-3.3V 3.3V 5V
GND GND
SCK SCK2 PB5
MISO MISO2 PB4
MOSI MOSI2 PB3
SCK1 PB7
MISO1 PB6
MOSI1 PB5
SW5
Figure 8-1: mikroBUS™ socket with DIP switches schematic
MISO PWM
- SPI Slave Output line
MOSI INT
- SPI Slave Input line - Interrupt line
+3.3V - VCC-3.3V power line RX - UART Receive line
GND - Reference Ground TX - UART Transmit line
PD4 PA0
AN PWM
PD2 PA1
RST INT
PD0 PA3
CS RX
PD1 SCK
SCK TX
SCL MISO
MISO SCL
SDA MOSI
MOSI SDA
2
VCC-5V VCC-3.3V 3.3V 5V
GND GND
SCK SCK4 PA4
MISO MISO4 PA5
MOSI MOSI4 PA6
SCK3 PB2
MISO3 PB1
MOSI3 PB0
SW3
SCL
- PWM output line - I2C Clock line
SDA
- I2C Data line
+5V - VCC-5V power line
GND - Reference Ground
PD5 PA4
AN PWM
PD3 PB0
RST INT
PD0 PB4
CS RX
PD1 SCK
SCK TX
SCL MISO
MISO SCL
SDA MOSI
MOSI SDA
3
VCC-5V VCC-3.3V 3.3V 5V
GND GND
SCL SCL4 PB2
SDA SDA4 PB0
SCL3 PC0
SDA3 PC1
SCL2 PC5
SDA2 PC4
SCL1 PA4
SDA1 PA6
SW6
EasyAVR
PB3
PB2
PD2
PD3
SCL
SDA
VCC-5V
DIP20B
DIP40B
DIP28
DIP14
v7