PIC16F72SLASHML datasheet(48/136 Pages) MICROCHIP

48 / 136 page

PIC16F72

DS39597B-page 46

 2002 Microchip Technology Inc.

FIGURE 9-1:

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, re-initialize the SSPCON reg-

ister, and then set bit SSPEN. This configures the 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 TRISC register)

appropriately programmed. That is:

• SDI must have TRISC<4> set

• SDO must have TRISC<5> cleared

• SCK (Master mode) must have TRISC<3>

cleared

• SCK (Slave mode) must have TRISC<3> set

• SS must have TRISA<5> set and ADCON must

be configured such that RA5 is a digital I/O

TABLE 9-1:

REGISTERS ASSOCIATED WITH SPI OPERATION

Read

Write

Internal

Data Bus

RC4/SDI/SDA

RC5/SDO

RA5/AN4/SS

RC3/SCK/

SSPSR reg

SSPBUF reg

SSPM3:SSPM0

bit0

Shift

Clock

SS Control

Enable

Edge

Select

Clock Select

TMR2 Output

TCY

Prescaler

4, 16, 64

TRISC<3>

Edge

Select

SCL

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

INTE

RBIE

TMR0IF

INTF

RBIF

0000 000x

0000 000u

0Ch

PIR1

—

ADIF

—

SSPIF

CCP1IF TMR2IF TMR1IF -0-- 0000 0000 0000

8Ch

PIE1

—

ADIE

—

SSPIE

CCP1IE TMR2IE TMR1IE -0-- 0000 0000 0000

87h

TRISC

PORTC 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

85h

TRISA

—

PORTA Data Direction Register

--11 1111

94h

SSPSTAT

—

D/A

R/W

--00 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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