ST72F521M Datasheet, PDF (140/199 Pages) STMicroelectronics – 8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE

ST72521M/R/AR
CONTROLLER AREA NETWORK (Cont’d)
FILTER HIGH REGISTERS (FHRx)
Read/Write
Reset Value: Undefined
7
0
FIL11 FIL10 FIL9 FIL8 FIL7 FIL6 FIL5 FlL4
FIL[11:3] are the most significant 8 bits of a 12-bit
message filter. The acceptance filter is compared
bit by bit with the identifier and the RTR bit of the
incoming message. If there is a match for the set
of bits specified by the acceptance mask then the
message is stored in a receive buffer.
FILTER LOW REGISTERS (FLRx)
Read/Write
Reset Value: Undefined
7
0
FIL3 FIL2 FIL1 FIL0 0
0
0
0
FIL[3:0] are the least significant 4 bits of a 12-bit
message filter.
MASK HIGH REGISTERS (MHRx)
Read/Write
Reset Value: Undefined
7
0
MSK1 MSK1 _{MSK9 MSK8 MSK7 MSK6 MSK5 MSK4}
1
0
MSK[11:3] are the most significant 8 bits of a 12-
bit message mask. The acceptance mask defines
which bits of the acceptance filter should match
the identifier and the RTR bit of the incoming mes-
sage.
MSK_i = 0: don’t care.
MSK_i = 1: match required.
MASK LOW REGISTERS (MLRx)
Read/Write
Reset Value: Undefined
7
0
MSK3 MSK2 MSK1 MSK0 0
0
0
0
MSK[3:0] are the least significant 4 bits of a 12-bit
message mask.
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