M16C Datasheet, PDF (180/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Preliminary Specifications REV.B
Mitsubishi microcomputers
Specifications in this manual are tentative and subject to change.
M16C / 6N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
CAN Module
CAN Time Stamp Register
• The CPU can read out the content of the 16 bit timer responsible for the time stamp function of the CAN
module.
CAN Time Stamp Register
(b15)
b7
(b8)
b0 b7
b0 Symbol
C0TSR
C1TSR
Address
021F₁₆, 021E₁₆
023F₁₆ , 023E₁₆
When reset
0000 ₁₆
0000₁₆
Function
Time Stamp (16 Bit)
Counts the CAN bus bit cycles
Values that can be read R W
0000₁₆ to FFFF₁₆
O-
Figure 18-18. CAN time stamp register
The basic clock for this timer is the bit clock derived from the CAN bus bit timing. The content of the timer is
increased by one when received or transmitted frame bits. When the CAN bus is idle, the timer is increased
by the nominal bit rate, which is defined in the CAN Configuration Register.
By help of an additional prescaler structure, the basic clock can be divided by the scale factor 1/1, 1/2,
1/4 or 1/8 (refer to the description of the CAN Control Register).
For the 'time stamp' function the content of the counter is captured after the current message on the bus is
declared to be valid. This decision is made in conformity to the definition of a 'successful receive process'
based on the CAN specification. This 'time stamp' is stored in the message buffer which corresponds to the
successful receive process.
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