L9803 datasheet(88/126 Pages) STMICROELECTRONICS

88 / 126 page

On-Chip Peripherals

L9803

88/126

ACC = 0: Match for Filter/Mask0. Possible match for Filter/Mask1.

ACC = 1: No match for Filter/Mask0 and match for Filter/Mask1.

Reset by hardware when either RDY or RXIF gets reset.

Bit 2 = RDY Message Ready

− Read/Clear

Set by hardware to signal that a new error-free message is available (LOCK = 0) or that a

transmission request is pending (LOCK = 1).

Cleared by software when LOCK = 0 to release the buffer and to clear the corresponding

RXIF bit in the Interrupt Status Register.

Cleared by hardware when LOCK = 1 to indicate that the transmission request has been

serviced or cancelled.

Bit 1 = BUSY Busy Buffer

− Read Only

Set by hardware when the buffer is being filled (LOCK = 0) or emptied (LOCK = 1).

Reset by hardware when the buffer is not accessed by the CAN core for transmission nor

reception purposes.

Bit 0 = LOCK Lock Buffer

− Read/Set/Clear

Set by software to lock a buffer. No more message can be received into the buffer thus

preserving its content and making it available for transmission.

Cleared by software to make the buffer available for reception. Cancels any pending

transmission request.

Cleared by hardware once a message has been successfully transmitted provided the early

transmit interrupt mode is on. Left untouched otherwise.

Note that in order to prevent any message corruption or loss of context, LOCK cannot be set

nor reset while BUSY is set. Trying to do so will result in LOCK not changing state.

Pages 4 Registers

FILTER HIGH REGISTERS (FHRx)

Read/Write

Reset Value: Undefined

FIL[11:4] 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

FIL11

FIL10

FIL9

FIL8

FIL7

FIL6

FIL5

FlL4

FIL3

FIL2

FIL1

FIL0

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