Information

SSP MODULE

3. Module: SSP (I

C Mode)

The description of the I

C pins related to the TRIS

bits is clarified. To ensure proper communication

of the I

C Slave mode, the TRIS bits (TRISx [SDA,

SCL]) corresponding to the I

C pins must be set to

‘1’. If any TRIS bits (TRISx<7:0>) of the port con-

taining the I

C pins (PORTx [SDA, SCL]) are

changed in software during I

C communication

using a Read-Modify-Write instruction (BSF, BCF),

then the I

C mode may stop functioning properly

and I

C communication may suspend. Do not

change any of the TRISx bits (TRIS bits of the port

containing the I

C pins) using the instruction BSF

or BCF during I

C communication. If it is absolutely

necessary to change the TRISx bits during

communication, the following method can be

used:

Note: This correction applies to the Data Sheets

for the following devices:

• PIC14000 (DS40122B)

• PIC16C6X (DS30234D) except

PIC16C61 (does not implement SSP

module)

• PIC16C62B/72A (DS35008B)

• PIC16C63A/65B/73B/74B (DS30605C)

• PIC16C72/73/73A/74/74A/76/77

(DS30390E)

• PIC16C923/924 (DS30444E)

• PIC16C925/926 (DS39544A)

• PIC16F72 (DS39597B)

• PIC16F73/74/76/77 (DS30325B)

MOVF TRISC, W ; Example for a 40-pin part such as the PIC16F73

IORLW 0x18 ; Ensures <4:3> bits are ‘11’

ANDLW B’11111001’ ; Sets <2:1> as output, but will not alter other bits

; User can use their own logic here, such as IORLW, XORLW and ANDLW

MOVWF TRISC