PIC16F87 datasheet(90/230 Pages) MICROCHIP

90 / 230 page

PIC16F87/88

DS30487D-page 90

 2002-2013 Microchip Technology Inc.

FIGURE 10-1:

SSP BLOCK DIAGRAM

(SPI MODE)

To enable the serial port, SSP Enable bit, SSPEN

(SSPCON<5>), must be set. To reset or reconfigure

SPI mode, clear bit SSPEN, reinitialize the SSPCON

SDI, SDO, SCK and SS pins as serial port pins. For the

pins to behave as the serial port function, they must

have their data direction bits (in the TRISB register)

appropriately programmed. That is:

• SDI must have TRISB<1> set

• SDO must have TRISB<2> cleared

• SCK (Master mode) must have TRISB<4>

cleared

• SCK (Slave mode) must have TRISB<4> set

•SS must have TRISB<5> set

TABLE 10-1:

REGISTERS ASSOCIATED WITH SPI OPERATION

Read

Write

Internal

Data Bus

RB1/SDI/SDA

RB2/SDO/RX/DT

RB5/SS/

RB4/SCK/

SSPSR reg

SSPBUF reg

SSPM3:SSPM0

bit0

Shift

Clock

SS Control

Enable

Edge

Select

Clock Select

TMR2 Output

TCY

Prescaler

4, 16, 64

TRISB<4>

Edge

Select

SCL

TX/CK

Note 1: When the SPI is in Slave mode with SS pin

control enabled (SSPCON<3:0> = 0100),

the SPI module will reset if the SS pin is

set to VDD.

2: If the SPI is used in Slave mode with

CKE = 1, then the SS pin control must be

enabled.

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

TMR0IE INT0IE

RBIE

TMR0IF

INT0IF

RBIF

0000 000x

0000 000u

0Ch

PIR1

—

ADIF(1)

RCIF

TXIF

SSPIF

CCP1IF TMR2IF TMR1IF -000 0000 -000 0000

8Ch

PIE1

—

ADIE(1)

RCIE

TXIE

SSPIE

CCP1IE TMR2IE TMR1IE -000 0000 -000 0000

86h

TRISB

PORTB Data Direction Register

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

94h

SSPSTAT

SMP

CKE

D/A

R/W

0000 0000

Legend:

= unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used by the SSP in SPI mode.

Note

This bit is only implemented on the PIC16F88. The bit will read ‘0’ on the PIC16F87.

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