MC9S12HZ256 Datasheet, PDF (359/692 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 12 Freescale’s Scalable Controller Area Network (MSCANV2)
12.3.3 Programmer’s Model of Message Storage
The following section details the organization of the receive and transmit message buffers and the
associated control registers.
To simplify the programmer interface, the receive and transmit message buffers have the same outline.
Each message buffer allocates 16 bytes in the memory map containing a 13 byte data structure.
An additional transmit buffer priority register (TBPR) is defined for the transmit buffers. Within the last
two bytes of this memory map, the MSCAN stores a special 16-bit time stamp, which is sampled from an
internal timer after successful transmission or reception of a message. This feature is only available for
transmit and receiver buffers, if the TIME bit is set (see Section 12.3.2.1, “MSCAN Control Register 0
(CANCTL0)”).
The time stamp register is written by the MSCAN. The CPU can only read these registers.
Table 12-25. Message Buffer Organization
Offset
Address
Register
0x00X0 Identifier Register 0
0x00X1 Identifier Register 1
0x00X2 Identifier Register 2
0x00X3 Identifier Register 3
0x00X4 Data Segment Register 0
0x00X5 Data Segment Register 1
0x00X6 Data Segment Register 2
0x00X7 Data Segment Register 3
0x00X8 Data Segment Register 4
0x00X9 Data Segment Register 5
0x00XA Data Segment Register 6
0x00XB Data Segment Register 7
0x00XC
0x00XD
0x00XE
0x00XF
Data Length Register
Transmit Buffer Priority Register¹
Time Stamp Register (High Byte)²
Time Stamp Register (Low Byte)³
1 _{Not applicable for receive buffers}
2 _{Read-only for CPU}
3 _{Read-only for CPU}
Access
Figure 12-21 shows the common 13-byte data structure of receive and transmit buffers for extended
identifiers. The mapping of standard identifiers into the IDR registers is shown in Figure 12-22.
All bits of the receive and transmit buffers are ‘x’ out of reset because of RAM-based implementation¹.
All reserved or unused bits of the receive and transmit buffers always read ‘x’.
1. Exception: The transmit priority registers are 0 out of reset.
MC9S12HZ256 Data Sheet, Rev. 2.04
Freescale Semiconductor
359