PIC18F4431-E/P Microchip Technology, PIC18F4431-E/P Datasheet - Page 225
![IC MCU FLASH 8KX16 40DIP](/photos/6/61/66192/150-40-dip_sml.jpg)
PIC18F4431-E/P
Manufacturer Part Number
PIC18F4431-E/P
Description
IC MCU FLASH 8KX16 40DIP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F818-ISO.pdf
(6 pages)
3.PIC18F2331-ISO.pdf
(392 pages)
4.PIC18F2331-ISO.pdf
(8 pages)
5.PIC18F2331-ISO.pdf
(6 pages)
6.PIC18F2331-ISO.pdf
(16 pages)
7.PIC18LF2331-ISO.pdf
(40 pages)
8.PIC18F4331-EP.pdf
(400 pages)
Specifications of PIC18F4431-E/P
Core Size
8-Bit
Program Memory Size
16KB (8K x 16)
Core Processor
PIC
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
Number Of I /o
36
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 9x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
40-DIP (0.600", 15.24mm)
Controller Family/series
PIC18
No. Of I/o's
36
Eeprom Memory Size
256Byte
Ram Memory Size
768Byte
Cpu Speed
40MHz
No. Of Timers
4
Processor Series
PIC18F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
768 B
Interface Type
EUSART, I2C, SPI, SSP
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
36
Number Of Timers
1 x 8
Operating Supply Voltage
2 V to 5.5 V
Maximum Operating Temperature
+ 125 C
Mounting Style
Through Hole
3rd Party Development Tools
52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
9 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
DVA18XP400 - DEVICE ADAPTER 18F4220 PDIP 40LDACICE0206 - ADAPTER MPLABICE 40P 600 MIL
Lead Free Status / Rohs Status
Details
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- PIC16F616T-ISL PDF datasheet
- PIC16F818-ISO PDF datasheet #2
- PIC18F2331-ISO PDF datasheet #3
- PIC18F2331-ISO PDF datasheet #4
- PIC18F2331-ISO PDF datasheet #5
- PIC18F2331-ISO PDF datasheet #6
- PIC18LF2331-ISO PDF datasheet #7
- PIC18F4331-EP PDF datasheet #8
- Current page: 225 of 392
- Download datasheet (4Mb)
20.2.3
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
the ABDEN bit is set. The calculation is self-averaging.
In the Auto-Baud Rate Detect (ABD) mode, the clock to
the BRG is reversed. Rather than the BRG clocking the
incoming RX signal, the RX signal is timing the BRG. In
ABD mode, the internal Baud Rate Generator is used
as a counter to time the bit period of the incoming serial
byte stream.
Once the ABDEN bit is set, the state machine will clear
the BRG and look for a Start bit. The Auto-Baud Detect
must receive a byte with the value of 55h (ASCII “U”,
which is also the LIN/J2602 bus Sync character) in
order to calculate the proper bit rate. The measurement
takes over both a low and a high bit time in order to
minimize any effects caused by asymmetry of the
incoming signal. After a Start bit, the SPBRG begins
counting up, using the preselected clock source on the
first rising edge of RX. After eight bits on the RX pin, or
the fifth rising edge, an accumulated value totalling the
proper BRG period is left in the SPBRGH:SPBRG
registers. Once the 5th edge is seen (should
correspond to the Stop bit), the ABDEN bit is
automatically cleared.
While calibrating the baud rate period, the BRG regis-
ters are clocked at 1/8th the preconfigured clock rate.
The BRG clock can be configured by the BRG16 and
BRGH bits. The BRG16 bit must be set to use both
SPBRG and SPBRGH as a 16-bit counter.
FIGURE 20-1:
2010 Microchip Technology Inc.
BRG Clock
BRG Value
Note 1:
ABDEN bit
(Interrupt)
SPBRGH
RCIF bit
RCREG
SPBRG
RX Pin
20-1) begins whenever a Start bit is received and
Read
AUTO-BAUD RATE DETECT
The ABD sequence requires the EUSART module to be configured in Asynchronous mode and WUE = 0.
Set by user
XXXXh
AUTOMATIC BAUD RATE CALCULATION
0000h
Start
PIC18F2331/2431/4331/4431
Bit 0
XXXXh
XXXXh
Edge #1
Bit 1
Bit 2
Edge #2
This allows the user to verify that no carry occurred for 8-
bit modes by checking for 00h in the SPBRGH register.
Refer to
While the ABD sequence takes place, the EUSART
state machine is held in Idle. The RCIF interrupt is set
once the fifth rising edge on RX is detected. The value
in the RCREG needs to be read to clear the RCIF
interrupt. RCREG content should be discarded.
TABLE 20-4:
BRG16
Note 1: If the WUE bit is set with the ABDEN bit,
Bit 3
0
0
1
1
(1)
Table 20-4
2: It is up to the user to determine that the
3: To maximize baud rate range, setting
Bit 4
Edge #3
BRGH
Auto-Baud Rate Detection will occur on
the byte following the Break character
(see
Sync Break
incoming character baud rate is within the
range of the selected BRG clock source.
Some combinations of oscillator frequency
and EUSART baud rates are not possible
due to bit error rates. Overall system timing
and communication baud rates must be
taken into consideration when using the
Auto-Baud Rate Detection feature.
the BRG16 bit is recommended if the
auto-baud feature is used.
0
1
0
1
Bit 5
Section 20.3.4 “Auto-Wake-up on
BRG COUNTER CLOCK
RATES
for counter clock rates to the BRG.
Bit 6
Edge #4
Character”).
BRG Counter Clock
Bit 7
F
F
F
F
OSC
OSC
OSC
OSC
DS39616D-page 225
Stop Bit
Edge #5
/512
/256
/128
/32
Auto-Cleared
001Ch
1Ch
00h
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