PICkit? Serial Analyzer Firmware
9.7
SPI COMMUNICATIONS
SPI is a 4-wire serial protocol that uses data in, data out, clock and Chip Select pins. It
is a very basic protocol using a clock edge to capture data. The CONTROL_BLOCK is
used to enable SPI event markers, set the bit rate and configure transaction/protocol
options.
TABLE 9-20:
Pin
1
2
3
4
5
6
TABLE 9-21:
CONNECTOR PINOUT IN SPI MODE
Description
CS
+V
G ND
SDI
SCK
SDO
SPI CONTROL BLOCK
Byte
16
17
18
19
20
21
22
23
? 2007 Microchip Technology Inc.
Bit
7:0
0
1
2
3
4
5
6
7
7:0
0
1
2
3
4
5
6
7
7:0
7:0
7:0
7:0
7:0
7:0
Description
COMM: SPI
Bit flags
1 = Event marker enable: read byte
1 = Event marker enable: write byte
1 = Event marker enable: status error
1 =
1 =
1 =
1 =
1 =
SPI Configuration bits
1 = SMP (sample phase)
1 = CKE (clock edge select)
1 = CKP (clock polarity)
1 = DAOD (disable auto output disable on data input)
1 = SS
1 =
1 = SLAVE
1 = MASTER
BIT RATE: Pre-scale code
BIT RATE: Scale code
DS51647A-page 87
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