Information

© 2008 Microchip Technology Inc. DS80209H-page 13
PIC18F2420/2520/4420/4520
44. Module: Master Synchronous Serial Port
(MSSP) – I
2
C Slave
Operating in 7-bit I
2
C Slave mode
(SSPM3:SSPM0 = 0110), the MSSP module of
this silicon version may not send a NACK bit (ACK)
in response to receiving the slave address loaded
in SSPADD<7:1>.
The affected addresses are in the following
ranges:
• 0x00 to 0x07
• 0x78 to 0x7F (available when using 10-bit slave
addressing)
These addresses are reserved, as specified in
“I
2
C™ Bus Specification and User Manual”,
Revision 03, 19 June 2007. Section 3.12,
“Reserved Addresses”, defines the purposes of
these addresses.
The specification is available at:
http://www.semiconductors.philips.com/i2c.
Work around
Do either of the following:
• Change the 7-bit slave address in SSPADD to
an address in the range of 0x08 to 0x77.
• Use Revision B silicon
This version of silicon removes this issue’s
addressing restrictions.
Date Codes that pertain to this issue:
All engineering and production devices.