MEC1322 Datasheet, PDF (404/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
38.6 Serial Port (UART) Data Timing
FIGURE 38-13: SERIAL PORT DATA
Data
TXD1, 2
Start
t1
Data (5-8 Bits)
Parity ^{Stop (1-2 Bits)}
TABLE 38-11: SERIAL PORT DATA PARAMETERS
Name
Description
MIN TYP
MAX
Units
t1
Serial Port Data Bit Time
t_BR
(Note 3
nsec
8-8)
Note 38-8 tBR is 1/Baud Rate. The Baud Rate is programmed through the Baud_Rate_Divisor bits located in
the Programmable Baud Rate Generator registers. The selectable baud rates are listed in Table 14-
7, "UART Baud Rates using Clock Source 1.8432MHz_Clk" and Table 14-8, "UART Baud Rates using
Clock Source 24MHz_Clk". Some of the baud rates have some percentage of error because the clock
does not divide evenly. This error can be determined from the values in these baud rate tables.
DS00001719D-page 404
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