PIC876 datasheet(73/218 Pages) MICROCHIP

73 / 218 page

 2001 Microchip Technology Inc.

DS30292C-page 71

PIC16F87X

9.1.2

SLAVE MODE

In Slave mode, the data is transmitted and received as

the external clock pulses appear on SCK. When the last

bit is latched, the interrupt flag bit SSPIF (PIR1<3>) 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 will wake-up

from SLEEP.

FIGURE 9-3:

SPI MODE TIMING (SLAVE MODE WITH CKE = 0)

FIGURE 9-4:

SPI MODE TIMING (SLAVE MODE WITH CKE = 1)

Note 1: When the SPI module is in Slave

mode

with

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 SS pin control must be

enabled.

SCK (CKP = 0)

SDI (SMP = 0)

SSPIF

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

SCK (CKP = 1)

SDO

bit7

bit0

SS (optional)

SCK (CKP = 0)

SDI (SMP = 0)

SSPIF

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

SCK (CKP = 1)

SDO

bit7

bit0

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