DV164136 Microchip Technology, DV164136 Datasheet - Page 275
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DV164136
Manufacturer Part Number
DV164136
Description
DEVELOPMENT KIT FOR PIC18
Manufacturer
Microchip Technology
Series
PIC®r
Type
MCUr
Datasheets
1.DM183032.pdf
(38 pages)
2.DV164136.pdf
(448 pages)
3.DV164136.pdf
(6 pages)
4.DV164136.pdf
(446 pages)
5.DV164136.pdf
(4 pages)
6.DV164136.pdf
(18 pages)
Specifications of DV164136
Contents
Board, Cables, CDs, PICkit™ 3 Programmer, Power Supply
Processor To Be Evaluated
PIC18F8722, PIC18F87J11
Interface Type
RS-232, USB
Operating Supply Voltage
3.3 V, 5 V
Silicon Manufacturer
Microchip
Core Architecture
PIC
Core Sub-architecture
PIC18
Silicon Core Number
PIC18F
Silicon Family Name
PIC18F8xxx
Kit Contents
PIC18 Exp Brd PICkit 3 Cable CD PSU
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
PIC18F8722, PIC18F87J11
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DV164136
Manufacturer:
MICROCHIP
Quantity:
12 000
- DM183032 PDF datasheet
- DV164136 PDF datasheet #2
- DV164136 PDF datasheet #3
- DV164136 PDF datasheet #4
- DV164136 PDF datasheet #5
- DV164136 PDF datasheet #6
- Current page: 275 of 448
- Download datasheet (8Mb)
20.1
The BRG is a dedicated, 8-bit or 16-bit generator that
supports both the Asynchronous and Synchronous
modes of the EUSART. By default, the BRG operates
in 8-bit mode; setting the BRG16 bit (BAUDCONx<3>)
selects 16-bit mode.
The SPBRGHx:SPBRGx register pair controls the period
of a free-running timer. In Asynchronous mode, bits
BRGH (TXSTAx<2>) and BRG16 (BAUDCONx<3>) also
control the baud rate. In Synchronous mode, BRGH is
ignored. Table 20-1 shows the formula for computation of
the baud rate for different EUSART modes which only
apply in Master mode (internally generated clock).
Given the desired baud rate and F
integer value for the SPBRGHx:SPBRGx registers can
be calculated using the formulas in Table 20-1. From this,
the error in baud rate can be determined. An example
calculation is shown in Example 20-1. Typical baud rates
and error values for the various Asynchronous modes
are shown in Table 20-2. It may be advantageous to use
TABLE 20-1:
© 2009 Microchip Technology Inc.
Legend: x = Don’t care, n = value of SPBRGHx:SPBRGx register pair
SYNC
0
0
0
0
1
1
Baud Rate Generator (BRG)
Configuration Bits
BAUD RATE FORMULAS
BRG16
0
0
1
1
0
1
BRGH
0
1
0
1
x
x
OSC
, the nearest
BRG/EUSART Mode
16-bit/Asynchronous
16-bit/Asynchronous
16-bit/Synchronous
8-bit/Asynchronous
8-bit/Asynchronous
8-bit/Synchronous
PIC18F87J11 FAMILY
the high baud rate (BRGH = 1) or the 16-bit BRG to
reduce the baud rate error, or achieve a slow baud rate
for a fast oscillator frequency.
Writing a new value to the SPBRGHx:SPBRGx regis-
ters causes the BRG timer to be reset (or cleared). This
ensures the BRG does not wait for a timer overflow
before outputting the new baud rate.
20.1.1
The device clock is used to generate the desired baud
rate. When one of the power-managed modes is
entered, the new clock source may be operating at a
different frequency. This may require an adjustment to
the value in the SPBRGx register pair.
20.1.2
The data on the RXx pin (either RC7/RX1/DT1 or
RG2/RX2/DT2) is sampled three times by a majority
detect circuit to determine if a high or a low level is
present at the RXx pin.
OPERATION IN POWER-MANAGED
MODES
SAMPLING
Baud Rate Formula
F
F
F
OSC
OSC
OSC
/[64 (n + 1)]
/[16 (n + 1)]
/[4 (n + 1)]
DS39778D-page 275
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