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PIC16F946
DS41265A-page 174
Preliminary
2005 Microchip Technology Inc.
14.8
Sleep Operation
In Master mode, all module clocks are halted and the
transmission/reception will remain in that state until the
device wakes from Sleep. After the device returns to
normal mode, the module will continue to trans-
mit/receive data.
In Slave mode, the SPI Transmit/Receive Shift register
operates asynchronously to the device. This allows the
device to be placed in Sleep mode and data to be
shifted into the SPI Transmit/Receive Shift register.
When all 8 bits have been received, the SSP interrupt
flag bit will be set and if enabled, will wake the device
from Sleep.
14.9
Effects of a Reset
A Reset disables the SSP module and terminates the
current transfer.
14.10 Bus Mode Compatibility
Table 14-1 shows the compatibility between the
standard SPI modes and the states of the CKP and
CKE control bits.
TABLE 14-1:
SPI BUS MODES
There is also a SMP bit which controls when the data is
sampled.
TABLE 14-2:
REGISTERS ASSOCIATED WITH SPI OPERATION
Standard SPI
Mode Terminology
Control Bits State
CKP
CKE
0, 0
0
1
0, 1
0
1, 0
1
1, 1
1
0
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on:
POR,
BOR
Value on
all other
Resets
0Bh,8Bh.
10Bh,18Bh
INTCON
GIE
PEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF
0000 000x
0Ch
PIR1
EEIF
ADIF
RCIF
TXIF
SSPIF
CCP1IF
TMR2IF
TMR1IF
0000 0000
13h
SSPBUF
Synchronous Serial Port Receive Buffer/Transmit Register
xxxx xxxx
uuuu uuuu
14h
SSPCON
WCOL
SSPOV
SSPEN
CKP
SSPM3
SSPM2
SSPM1
SSPM0
0000 0000
87h
TRISC
TRISC7
TRISC6
TRISC5
TRISC4
TRISC3
TRISC2
TRISC1
TRISC0
1111 1111
8Ch
PIE1
EEIE
ADIE
RCIE
TXIE
SSPIE
CCP1IE
TMR2IE
TMR1IE
0000 0000
85h
TRISA
TRISA7
TRISA6
TRISA5
TRISA4
TRISA3
TRISA2
TRISA1
TRISA0
1111 1111
94h
SSPSTAT
SMP
CKE
D/A
P
S
R/W
UA
BF
0000 0000
Legend:
x
= unknown, u = unchanged, – = unimplemented, read as ‘0’. Shaded cells are not used by the SSP in SPI mode.
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