Information

© 2007 Microchip Technology Inc. DS80324B-page 1
PIC18F1220/1320
Clarifications/Corrections to the Data
Sheet:
In the Device Data Sheet (DS39605F), the following
clarifications and corrections should be noted. Any sili-
con issues related to the PIC18F1220/1320 will be
reported in a separate silicon errata. Please check the
Microchip web site for any existing issues.
1. Module: Enhanced Addressable
Universal Synchronous
Asynchronous Receiver
Transmitter (EUSART)
The note box is added after the second paragraph
of Section 16.2.3 “Auto-Baud Rate Detect”, on
Page 139. The two paragraphs and note appear
as shown.
16.2.3 AUTO-BAUD RATE DETECT
The Enhanced USART module supports the automatic
detection and calibration of baud rate. This feature is
active only in Asynchronous mode and while the WUE
bit is clear.
The automatic baud rate measurement sequence
(Figure 16-1) begins whenever a Start bit is received and
the ABDEN bit is set. The calculation is self-averaging.
2. Module: Enhanced Capture/Compare/
PWM (ECCP)
In Section 15.5.9 “Setup for PWM Operation”,
two words are changed in the first step of the
procedure for setting up the ECCP module for
Pulse-Width Modulation (PWM).
The step now reads as shown, with bold text
indicating the changes.
1. Configure the PWM pins P1A and P1B (and
P1C and P1D, if used) as outputs by clearing
the corresponding TRISB bits.
Note: Some silicon revisions use the falling
edges of the Sync byte for baud rate
measurement. In these devices, ABDEN
may be set during the preceding Break.
In other silicon revisions, the rising edges
are used. In these devices, the RX input
must be high (Break completed) before
ABDEN is set. If this is not done, the end
of the Break signal could be interpreted as
the start of the Sync byte, for baud rate
measurement.
Code will work for both types of silicon
revisions if it waits for the end of the Break
signal before setting ABDEN.
PIC18F1220/1320 Data Sheet Errata