XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 408

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

MSCAN Controller (MSCAN08)
23.13.5 Transmit Buffer Priority Registers
23.14 Programmer’s Model of Control Registers
Technical Data
408
Address:
PRIO7–PRIO0 — Local Priority
The programmer’s model has been laid out for maximum simplicity and
efficiency.
of the MSCAN08.
Reset:
Read:
Write:
This field defines the local priority of the associated message buffer.
The local priority is used for the internal prioritisation process of the
MSCAN08 and is defined to be highest for the smallest binary
number. The MSCAN08 implements the following internal
prioritisation mechanism:
•
•
•
Figure 23-13. Transmit Buffer Priority Register (TBPR)
All transmission buffers with a cleared TXE flag participate in the
prioritisation right before the SOF is sent.
The transmission buffer with the lowest local priority field wins the
prioritisation.
In case more than one buffer has the same lowest priority, the
message buffer with the lower index number wins.
$05bD
PRIO7
Bit 7
u
Figure 23-14
MSCAN Controller (MSCAN08)
PRIO6
6
u
PRIO5
gives an overview on the control register block
5
u
PRIO4
4
u
PRIO3
3
u
MC68HC908AZ60A — Rev 2.0
PRIO2
2
u
PRIO1
1
u
MOTOROLA
PRIO0
Bit 0
u