PIC18F27J53T-I/SO Microchip Technology, PIC18F27J53T-I/SO Datasheet - Page 360
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PIC18F27J53T-I/SO
Manufacturer Part Number
PIC18F27J53T-I/SO
Description
28-pin, USB, 128KB Flash, 4KB RAM, 12 MIPS, 12-bit ADC, NanoWatt XLP 28 SOIC .30
Manufacturer
Microchip Technology
Series
PIC® XLP™ 18Fr
Specifications of PIC18F27J53T-I/SO
Core Processor
PIC
Core Size
8-Bit
Speed
48MHz
Connectivity
I²C, LIN, SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Ram Size
3.8K x 8
Voltage - Supply (vcc/vdd)
2.15 V ~ 3.6 V
Data Converters
A/D 10x10b/12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Processor Series
PIC18F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
3.8 KB
Interface Type
I2C, SPI, USART
Maximum Clock Frequency
48 MHz
Number Of Programmable I/os
16
Number Of Timers
8
Operating Supply Voltage
2.15 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
- Current page: 360 of 586
- Download datasheet (6Mb)
PIC18F47J53 FAMILY
21.2.5
The EUSART module has the capability of sending the
special Break character sequences that are required by
the LIN/J2602 bus standard. The Break character
transmit consists of a Start bit, followed by twelve ‘0’
bits and a Stop bit. The Frame Break character is sent
whenever the SENDB and TXEN bits (TXSTAx<3> and
TXSTAx<5>) are set while the Transmit Shift Register
is loaded with data.
Note that the value of data written to TXREGx will be
ignored and all ‘0’s will be transmitted.
The SENDB bit is automatically reset by hardware after
the corresponding Stop bit is sent. This allows the user
to preload the transmit FIFO with the next transmit byte
following the Break character (typically, the Sync
character in the LIN/J2602 specification).
Note that the data value written to the TXREGx for the
Break character is ignored. The write simply serves the
purpose of initiating the proper sequence.
The TRMT bit indicates when the transmit operation is
active or Idle, just as it does during normal transmis-
sion. See Figure 21-10 for the timing of the Break
character sequence.
FIGURE 21-10:
DS39964B-page 360
Reg. Empty Flag)
Reg. Empty Flag)
Reg. Empty Flag)
Write to TXREGx
(Transmit Buffer
(Transmit Shift
(Transmit Shift
BRG Output
(Shift Clock)
SENDB bit
TRMT bit
TXx (pin)
TXxIF bit
BREAK CHARACTER SEQUENCE
SEND BREAK CHARACTER SEQUENCE
Dummy Write
SENDB sampled here
Start Bit
Bit 0
Preliminary
Bit 1
Break
master.
21.2.5.1
The following sequence will send a message frame
header made up of a Break, followed by an Auto-Baud
Sync byte. This sequence is typical of a LIN/J2602 bus
1.
2.
3.
4.
5.
When the TXREGx becomes empty, as indicated by the
TXxIF, the next data byte can be written to TXREGx.
21.2.6
The Enhanced USART module can receive a Break
character in two ways.
The first method forces configuration of the baud rate
at a frequency of 9/13 of the typical speed. This allows
for the Stop bit transition to be at the correct sampling
location (13 bits for Break versus Start bit and 8 data
bits for typical data).
The second method uses the auto-wake-up feature
described in Section 21.2.4 “Auto-Wake-up on Sync
Break Character”. By enabling this feature, the
EUSART will sample the next two transitions on
RXx/DTx, cause an RCxIF interrupt and receive the
next data byte followed by another interrupt.
Note that following a Break character, the user will
typically want to enable the Auto-Baud Rate Detect
feature. For both methods, the user can set the ABDEN
bit once the TXxIF interrupt is observed.
Configure the EUSART for the desired mode.
Set the TXEN and SENDB bits to set up the
Break character.
Load the TXREGx with a dummy character to
initiate transmission (the value is ignored).
Write ‘55h’ to TXREGx to load the Sync
character into the transmit FIFO buffer.
After the Break has been sent, the SENDB bit is
reset by hardware. The Sync character now
transmits in the preconfigured mode.
RECEIVING A BREAK CHARACTER
Break and Sync Transmit Sequence
Bit 11
Auto-Cleared
2010 Microchip Technology Inc.
Stop Bit
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