PIC18F25K80 MICROCHIP [Microchip Technology], PIC18F25K80 Datasheet - Page 299
PIC18F25K80
Manufacturer Part Number
PIC18F25K80
Description
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F25K80.pdf
(628 pages)
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21.3.7
In Slave mode, the data is transmitted and received as
the external clock pulses appear on SCK. When the
last bit is latched, the SSPIF interrupt flag bit is set.
While in Slave mode, the external clock is supplied by
the external clock source on the SCK pin. This external
clock must meet the minimum high and low times as
specified in the electrical specifications.
While in Sleep mode, the slave can transmit/receive
data. When a byte is received, the device can be
configured to wake-up from Sleep.
21.3.8
The SS pin allows a Synchronous Slave mode. The
SPI must be in Slave mode with the SS pin control
enabled (SSPCON1<3:0> = 04h). When the SS pin is
low, transmission and reception are enabled and the
SDO pin is driven. When the SS pin goes high, the
SDO pin is no longer driven, even if in the middle of a
FIGURE 21-4:
2011 Microchip Technology Inc.
SS
SCK
(CKP = 0
CKE = 0)
SCK
(CKP = 1
CKE = 0)
Write to
SSPBUF
SDO
SDI
(SMP = 0)
Input
Sample
(SMP = 0)
SSPIF
Interrupt
Flag
SSPSR to
SSPBUF
SLAVE MODE
SLAVE SELECT
SYNCHRONIZATION
SLAVE SYNCHRONIZATION WAVEFORM
bit 7
bit 7
bit 6
Preliminary
PIC18F66K80 FAMILY
transmitted byte, and becomes a floating output.
External pull-up/pull-down resistors may be desirable
depending on the application.
When the SPI module resets, the bit counter is forced
to ‘ 0 ’. This can be done by either forcing the SS pin to
a high level or clearing the SSPEN bit.
To emulate two-wire communication, the SDO pin can
be connected to the SDI pin. When the SPI needs to
operate as a receiver, the SDO pin can be configured
as an input. This disables transmissions from the SDO.
The SDI can always be left as an input (SDI function)
since it cannot create a bus conflict.
Note 1: When the SPI is in Slave mode, with SS pin
2: If the SPI is used in Slave mode, with CKE
control enabled (SSPCON1<3:0> = 0100 ),
the SPI module will reset if the SS pin is set
to V
set, then the SS pin control must be
enabled.
bit 7
bit 7
DD
.
Next Q4 Cycle
after Q2
DS39977C-page 299
bit 0
bit 0
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