PIC18LF8680-I/PT Microchip Technology, PIC18LF8680-I/PT Datasheet - Page 238
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PIC18LF8680-I/PT
Manufacturer Part Number
PIC18LF8680-I/PT
Description
IC, 8BIT MCU, PIC18LF, 40MHZ, PLCC-64
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PCM18XK1.pdf
(496 pages)
3.PIC18F6585-IPT.pdf
(8 pages)
4.PIC18F6585-IPT.pdf
(38 pages)
5.PIC18F6585-IPT.pdf
(14 pages)
Specifications of PIC18LF8680-I/PT
Controller Family/series
PIC18
No. Of I/o's
39
Eeprom Memory Size
1024Byte
Ram Memory Size
3328Byte
Cpu Speed
40MHz
No. Of Timers
4
Core Size
8 Bit
Program Memory Size
32768 Words
Core Processor
PIC
Speed
40MHz
Connectivity
CAN, EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
68
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
3.25K x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 16x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
80-TFQFP
Rohs Compliant
Yes
Processor Series
PIC18LF
Core
PIC
Data Bus Width
8 bit
Data Ram Size
3328 B
Interface Type
I2C, SPI, AUSART, CAN
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
69
Number Of Timers
8
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, 52712-325, EWPIC18
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DV164136, DM183032
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18LF8680-I/PT
Manufacturer:
Microchip
Quantity:
230
Company:
Part Number:
PIC18LF8680-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
- PIC16F616T-ISL PDF datasheet
- PCM18XK1 PDF datasheet #2
- PIC18F6585-IPT PDF datasheet #3
- PIC18F6585-IPT PDF datasheet #4
- PIC18F6585-IPT PDF datasheet #5
- Current page: 238 of 496
- Download datasheet (9Mb)
PIC18F6585/8585/6680/8680
18.1.2
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 18-1) begins whenever a Start bit is received
and 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 55h (ASCII “U”,
which is also the LIN bus sync character) in order to
calculate the proper bit rate. The measurement is taken
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.
Note that the BRG clock will be configured by the
BRG16 and BRGH bits. Independent of the BRG16 bit
setting, both the SPBRG and SPBRGH will be used as
a 16-bit counter. This allows the user to verify that no
FIGURE 18-1:
DS30491C-page 236
BRG Value
BRG Clock
ABDEN bit
Note 1:
(Interrupt)
SPBRGH
RCIF bit
RCREG
SPBRG
RX pin
Read
AUTO-BAUD RATE DETECT
The ABD sequence requires the USART module to be configured in Asynchronous mode and WUE = 0.
Set by User
XXXXh
AUTOMATIC BAUD RATE CALCULATION
0000h
Start
Bit 0
XXXXh
XXXXh
Edge #1
Bit 1
Bit 2
Edge #2
carry occurred for 8-bit modes by checking for 00h in
the SPBRGH register. Refer to Table 18-4 for counter
clock rates to the BRG.
While the ABD sequence takes place, the USART 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 18-4:
BRG16
Note:
Note 1: If the WUE bit is set with the ABDEN bit,
Bit 3
0
0
1
1
2: It is up to the user to determine that the
Bit 4
Edge #3
BRGH
During the ABD sequence, SPBRG and
SPBRGH are both used as a 16-bit
counter independent of BRG16 setting.
auto-baud rate detection will occur on the
byte following the break character.
incoming character baud rate is within the
range of the selected BRG clock source.
Some combinations of oscillator fre-
quency and USART 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.
0
1
0
1
Bit 5
BRG COUNTER CLOCK
RATES
Bit 6
Edge #4
2004 Microchip Technology Inc.
BRG Counter Clock
Bit 7
F
F
F
F
OSC
OSC
OSC
OSC
Stop Bit
Edge #5
/512
/128
/128
/32
Auto-Cleared
001Ch
1Ch
00h
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