PIC16C76-04/SP View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC16C76-04/SP Datasheet PDF : 288 Pages
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PIC16C7X
Applicable Devices
72 73 73A 74 74A 76 77
The SS pin allows a synchronous slave mode. The
SPI must be in slave mode (SSPCON<3:0> = 04h)
and the TRISA<5> bit must be set the for synchro-
nous slave mode to be enabled. 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 mid-
dle of a transmitted byte, and becomes a floating
output. If the SS pin is taken low without resetting
SPI mode, the transmission will continue from the
point at which it was taken high. External pull-up/
pull-down resistors may be desirable, depending on the
application.
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.
FIGURE 11-5: SPI MODE TIMING, MASTER MODE OR SLAVE MODE W/O SS CONTROL
SCK
(CKP = 0)
SCK
(CKP = 1)
SDO
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
SDI
bit7
bit0
SSPIF
FIGURE 11-6: SPI MODE TIMING, SLAVE MODE WITH SS CONTROL
SS
SCK
(CKP = 0)
SCK
(CKP = 1)
SDO
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
SDI
bit7
bit0
SSPIF
TABLE 11-1: REGISTERS ASSOCIATED WITH SPI OPERATION
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
0Ch
8Ch
87h
INTCON
PIR1
PIE1
TRISC
GIE
PEIE T0IE INTE
PSPIF(1,2) ADIF RCIF(2) TXIF(2)
PSPIE(1,2) ADIE RCIE(2) TXIE(2)
PORTC Data Direction Register
RBIE
SSPIF
SSPIE
T0IF INTF RBIF 0000 000x 0000 000u
CCP1IF TMR2IF TMR1IF 0000 0000 0000 0000
CCP1IE TMR2IE TMR1IE 0000 0000 0000 0000
1111 1111 1111 1111
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 0000 0000
85h
TRISA
—
— PORTA Data Direction Register
--11 1111 --11 1111
94h
SSPSTAT
—
—
D/A
P
S
R/W
UA
BF --00 0000 --00 0000
Legend: x = unknown, u = unchanged, - = unimplemented read as '0'. Shaded cells are not used by the SSP in SPI mode.
Note 1: Bits PSPIE and PSPIF are reserved on the PIC16C73/73A, always maintain these bits clear.
2: The PIC16C72 does not have a Parallel Slave Port or USART, these bits are unimplemented, read as '0'.
DS30390E-page 82
© 1997 Microchip Technology Inc.
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