PIC16LF648A-I/SO Microchip Technology, PIC16LF648A-I/SO Datasheet - Page 75
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PIC16LF648A-I/SO
Manufacturer Part Number
PIC16LF648A-I/SO
Description
IC PIC MCU FLASH 4KX14 18SOIC
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F627A-IP.pdf
(180 pages)
2.PIC16LF627A-IP.pdf
(8 pages)
3.PIC16LF627A-ISO.pdf
(180 pages)
Specifications of PIC16LF648A-I/SO
Core Size
8-Bit
Program Memory Size
7KB (4K x 14)
Core Processor
PIC
Speed
20MHz
Connectivity
UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
16
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
18-SOIC (7.5mm Width)
Controller Family/series
PIC16LF
No. Of I/o's
16
Eeprom Memory Size
256Byte
Ram Memory Size
256Byte
Cpu Speed
20MHz
No. Of Timers
3
Processor Series
PIC16LF
Core
PIC
Data Bus Width
8 bit
Data Ram Size
256 B
Interface Type
SCI, USART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
16
Number Of Timers
1 x 16 bit
Operating Supply Voltage
2 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52715-96, 52716-328, 52717-734
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163014, DM164120-4
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16LF648A-I/SO
Manufacturer:
MICR
Quantity:
1 360
12.1
The BRG supports both the Asynchronous and
8-bit baud rate generator. The SPBRG register
Asynchronous mode, bit BRGH (TXSTA<2>) also
controls the baud rate. In Synchronous mode, bit
BRGH is ignored. Table 12-1 shows the formula for
computation of the baud rate for different USART
modes, which only apply in Master mode (internal
clock).
Given the desired baud rate and F
integer value for the SPBRG register can be calculated
using the formula in Table 12-1. From this, the error in
baud rate can be determined.
Example 12-1 shows the calculation of the baud rate
error for the following conditions:
TABLE 12-1:
TABLE 12-2:
© 2005 Microchip Technology Inc.
Synchronous modes of the USART. It is a dedicated
controls the period of a free running 8-bit timer. In
Legend:
Legend:
Address
SYNC
98h
18h
99h
F
Desired Baud Rate = 9600
BRGH = 0
SYNC = 0
OSC
0
1
USART Baud Rate Generator
(BRG)
= 16 MHz
X = value in SPBRG (0 to 255)
SPBRG
RCSTA
TXSTA
x = unknown, - = unimplemented read as ‘0’. Shaded cells are not used for the BRG.
Name
BAUD RATE FORMULA
REGISTERS ASSOCIATED WITH BAUD RATE GENERATOR
(Asynchronous) Baud Rate = F
Baud Rate Generator Register
(Synchronous) Baud Rate = F
CSRC
SPEN
Bit 7
BRGH = 0 (Low Speed)
Bit 6
RX9
TX9
OSC
SREN
TXEN
Bit 5
, the nearest
CREN
SYNC
Bit 4
OSC
OSC
PIC16F627A/628A/648A
/(64(X+1))
/(4(X+1))
ADEN
Bit 3
—
EQUATION 12-1:
It may be advantageous to use the high baud rate
(BRGH = 1) even for slower baud clocks. This is
because the F
baud rate error in some cases.
Writing a new value to the SPBRG register causes the
BRG timer to be reset (or cleared) and ensures the
BRG does not wait for a timer overflow before
outputting the new baud rate.
The data on the RB1/RX/DT pin is sampled three times
by a majority detect circuit to determine if a high or a
low level is present at the RX pin.
Error
BRGH
FERR
Bit 2
Calculated Baud Rate
=
TRMT
OERR
(Calculated Baud Rate - Desired Baud Rate)
---------------------------------------------------------------------------------------------------------- -
Bit 1
Desired Baud Rate
OSC
=
9615 9600
----------------------------- -
/(16(X + 1)) equation can reduce the
9600
Baud Rate = F
TX9D
RX9D
BRGH = 1 (High Speed)
Bit 0
9600
x
CALCULATING BAUD
RATE ERROR
–
Desired Baud Rate
=
=
25.042
16000000
----------------------- -
64 x
=
0000 -010
0000 000x
0000 0000
Value on
-------------------------- -
64 25
=
=
16000000
POR
NA
+
0.16%
-----------------------
64 x
OSC
1
Fosc
+
DS40044D-page 73
/(16(X+1))
+
1
1
other Resets
=
Value on all
0000 -010
0000 000x
0000 0000
9615