DM163006 datasheet(158/320 Pages) MICROCHIP

158 / 320 page

PIC18C601/801

DS39541A-page 158

Advance Information

 2001 Microchip Technology Inc.

15.3.6

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 transmit/

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 eight bits have been received, the MSSP

interrupt flag bit will be set and, if enabled, will wake the

device from SLEEP.

15.3.7

EFFECTS OF A RESET

A RESET disables the MSSP module and terminates

the current transfer.

15.3.8

BUS MODE COMPATIBILITY

Table 15-1 shows the compatibility between the stan-

dard SPI modes and the states of the CKP and CKE

control bits.

TABLE 15-1:

SPI BUS MODES

There is also a SMP bit that controls when the data will

be sampled.

TABLE 15-2:

REGISTERS ASSOCIATED WITH SPI OPERATION

Standard SPI Mode

Terminology

Control Bits State

CKP

CKE

0, 0

0, 1

1, 0

1, 1

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

INTCON

GIE/

GIEH

PEIE/

GIEL

TMR0IE

INT0IE

RBIE

TMR0IF

INT0IF

RBIF

0000 000x

0000 000u

PIR1

—

ADIF

RCIF

TXIF

SSPIF

CCP1IF

TMR2IF

TMR1IF -000 0000 -000 0000

PIE1

—

ADIE

RCIE

TXIE

SSPIE

CCP1IE

TMR2IE TMR1IE -000 0000 -000 0000

IPR1

—

ADIP

RCIP

TXIP

SSPIP

CCP1IP

TMR2IP TMR1IP -000 0000 -000 0000

TRISC

PORTC Data Direction Register

1111 1111

SSPBUF Synchronous Serial Port Receive Buffer/Transmit Register

xxxx xxxx

uuuu uuuu

SSPCON

WCOL

SSPOV SSPEN

CKP

SSPM3

SSPM2

SSPM1

SSPM0

0000 0000

TRISA

—

PORTA Data Direction Register

--11 1111

SSPSTAT

SMP

CKE

D/A

R/W

0000 0000

Legend: x = unknown, u = unchanged, - = unimplemented, read as '0'.

Shaded cells are not used by the MSSP in SPI mode.

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