PIC18F4685-I/P Microchip Technology, PIC18F4685-I/P Datasheet - Page 334

• Manufacturer Part Number: PIC18F4685-I/P
• Description: IC PIC MCU FLASH 48KX16 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4685-I/P

• Program Memory Type: FLASH
• Program Memory Size: 96KB (48K x 16)
• Package / Case: 40-DIP (0.600", 15.24mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: CAN, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 36
• Eeprom Size: 1K x 8
• Ram Size: 3.25K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 3.25 KB
• Interface Type: EUSART/I2C/MSSP/SPI
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 44
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 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, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 11-ch x 10-bit
• Package: 40PDIP
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 40 MHz
• Operating Supply Voltage: 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: I3-DB18F4680 - BOARD DAUGHTER ICEPIC3DVA18XP400 - DEVICE ADAPTER 18F4220 PDIP 40LD444-1001 - DEMO BOARD FOR PICMICRO MCU
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC18F2682/2685/4682/4685
In Mode 1 and 2, there are an additional 10 acceptance
filters, RXF6-RXF15, creating a total of 16 available
filters. RXF15 can be used either as an acceptance
filter or acceptance mask register. Each of these
acceptance filters can be individually enabled or
disabled by setting or clearing the RXFENn bit in the
RXFCONn register. Any of these 16 acceptance filters
can be dynamically associated with any of the receive
buffers. Actual association is made by setting appropri-
ate bits in the RXFBCONn register. Each RXFBCONn
register contains a nibble for each filter. This nibble can
be used to associate a specific filter to any of available
receive buffers. User firmware may associate more
than one filter to any one specific receive buffer.
In addition to dynamic filter to buffer association, in
Mode 1 and 2, each filter can also be dynamically
associated to available acceptance mask registers.
The FILn_m bits in the MSELn register can be used to
link a specific acceptance filter to an acceptance mask
register. As with filter to buffer association, one can
also associate more than one mask to a specific
acceptance filter.
When a filter matches and a message is loaded into the
receive buffer, the filter number that enabled the mes-
sage reception is loaded into the FILHIT bit(s). In
Mode 0 for RXB1, the RXB1CON register contains the
FILHIT<2:0> bits. They are coded as follows:
• 101 = Acceptance Filter 5 (RXF5)
• 100 = Acceptance Filter 4 (RXF4)
• 011 = Acceptance Filter 3 (RXF3)
• 010 = Acceptance Filter 2 (RXF2)
• 001 = Acceptance Filter 1 (RXF1)
• 000 = Acceptance Filter 0 (RXF0)
FIGURE 23-3:
DS39761C-page 334
Note:
RXFn
‘000’ and ‘001’ can only occur if the
RXB0DBEN bit is set in the RXB0CON
register, allowing RXB0 messages to
rollover into RXB1.
0
Acceptance Filter Register
Message Assembly Buffer
RXFn
Identifier
MESSAGE ACCEPTANCE MASK AND FILTER OPERATION
1
RXFn
n
RXMn
0
Acceptance Mask Register
RXMn
The coding of the RXB0DBEN bit enables these three
bits to be used similarly to the FILHIT bits and to
distinguish a hit on filter RXF0 and RXF1, in either
RXB0 or after a rollover into RXB1.
• 111 = Acceptance Filter 1 (RXF1)
• 110 = Acceptance Filter 0 (RXF0)
• 001 = Acceptance Filter 1 (RXF1)
• 000 = Acceptance Filter 0 (RXF0)
If the RXB0DBEN bit is clear, there are six codes
corresponding to the six filters. If the RXB0DBEN bit is
set, there are six codes corresponding to the six filters,
plus two additional codes corresponding to RXF0 and
RXF1 filters, that rollover into RXB1.
In Mode 1 and 2, each buffer control register contains
5 bits of filter hit bits (FILHIT<4:0>). A binary value of ‘0’
indicates a hit from RXF0 and 15 indicates RXF15.
If more than one acceptance filter matches, the FILHIT
bits will encode the binary value of the lowest num-
bered filter that matched. In other words, if filter RXF2
and filter RXF4 match, FILHIT will be loaded with the
value for RXF2. This essentially prioritizes the
acceptance filters with a lower number filter having
higher priority. Messages are compared to filters in
ascending order of filter number.
The mask and filter registers can only be modified
when the PIC18F2682/2685/4682/4685 devices are in
Configuration mode.
1
RXMn
n
© 2009 Microchip Technology Inc.
RxRqst