s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 266

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MSCAN Controller (MSCAN08)
interrupt with overrun indication will be generated if enabled. The MSCAN08 is still able to transmit
messages with both receive message buffers filled, but all incoming messages are discarded.
24.4.3 Transmit Structures
The MSCAN08 has a triple transmit buffer scheme to allow multiple messages to be set up in advance
and to achieve an optimized real-time performance. The three buffers are arranged as shown in
24-2.
All three buffers have a 13-byte data structure similar to the outline of the receive buffers (see
Programmer’s Model of Message
an 8-bit “local priority” field (PRIO) (see
266
MSCAN08
Figure 24-2. User Model for Message Buffer Organization
Storage). An additional transmit buffer priority register (TBPR) contains
MC68HC908AZ32A Data Sheet, Rev. 2
RxBG
24.12.5 Transmit Buffer Priority
RxFG
Tx0
Tx1
Tx2
PRIO
PRIO
PRIO
RXF
TXE
TXE
TXE
Registers).
CPU08 Ibus
Freescale Semiconductor
24.12
Figure