MCP25050-E/SL View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
MCP25050-E/SL Datasheet PDF : 66 Pages
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MCP2502X/5X
If the Error Condition message is enabled
(OPTREG2.TXONE = 1) and one of the above
conditions occur, the MCP2502X/5X sends TXID1
identifier with output message Read CAN Error States
data field (three data bytes).
4.5.4 SCHEDULED TRANSMISSIONS
The MCP2502X/5X has the capability of sending
scheduled transmissions (On Bus message), if
enabled.
The scheduled transmission control register (STCON)
enables and configures the occurrence of the
scheduled message. Setting the STEN bit in the
STCON register enables the scheduled message. The
STBF1:STBF0 and STM3:STM0 bits allow a scheduled
transmission to be initiated from a minimum of 256 µs
to a maximum of 16.8 seconds (using a 16 MHz FOSC)
and the following equation:
Scheduled Transmission
= STBF1:STBF0(STM3:STM0)
Message Type - The message sent for scheduled
transmissions consists of either TXID0 with zero data
bytes or TXID0 with eight data bytes containing the
Read A/D Regs message, depending on STMS bit in
the STCON register.
Note:
The actual scheduled transmission
intervals may vary slightly due to the
internal event que of the control module.
REGISTER 4-1:
STCON - SCHEDULED TRANSMISSION CONTROL REGISTER
R/W-0 R/W-0 R/W-1 R/W-1
R/W-1
R/W-1 R/W-1
STEN STMS STBF1 STBF0
STM3
STM2 STM1
bit 7
R/W-1
STM0
bit 0
bit 7
bit 6
bit 5-4
bit 3-0
STEN: Scheduled Transmission Enable bits
1 = Enabled
0 = Disabled
STMS: Scheduled Transmission Message Select
1 = Sends Transmit ID 0 (TXID0) with the “Read A/D Regs” data (DLC = 8)
0 = Sends Transmit ID 0 (TXID0) with no data (DLC = 0)
STBF1:STBF0: Base Transmission Frequency bits
00 = 4096TOSC
01 = 16•(4096TOSC)
10 = 256•(4096TOSC)
10 = 4096•(4096TOSC)
(e.g., STBF1:STBF0 => 00 => 256 µs for a 16 MHz FOSC)
STM3:STM0: Scheduled Transmission Multiplier bits
0000 = 1
0001 = 2
-
-
1110 = 15
1111 = 16
Legend:
R = Readable bit
- n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
DS21664D-page 28
© 2007 Microchip Technology Inc.
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