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Chapter 14
FCAN Interface Function
Preliminary User’s Manual U15839EE1V0UM00
14.2 Outline of the FCAN System
14.2.1 General
The FCAN (Full-CAN) system of the V850E/CA2 supports 2 or 4
Note
independent CAN modules (CAN
module 1, CAN module 2, CAN module 3
Note
, CAN module 4
Note
), which provide each an interface to a
Controller Area Network (CAN).
The CAN modules are conform to ISO 11898, former CAN specification version 2.0B active.
An external bus transceiver has to be used to connect a CAN module to a CAN bus. That external bus
transceiver converts the transmit data line and receive data line signals to the necessary electrical sig-
nal characteristic on the CAN bus itself.
All protocol activities in a CAN module are handled by hardware (transfer layer).
The CAN modules themselves provide no memory for the necessary data buffers, rather all CAN mod-
ules have access to the common CAN memory area via a memory access controller (MAC).
The MAC allows integration of machines other than CAN modules (e.g. CAN bridge). The CPU also
accesses to the common CAN memory via the MAC. The MAC offers data scan capability beside con-
trolling the arbitration of CAN modules or CPU accesses to the CAN memory.
By means of that scan capability inner priority inversions at message transmissions are automatically
avoided and received messages are sorted into the corresponding receive message buffers according
to an inner storage priority rule.
Figure 14-1:
Functional Blocks of the FCAN Interface
Note: CAN module 3 and CAN module 4 are available in the derivatives µPD703129 (A) and
µPD703129 (A1) only.
Internal Peripheral Bus (to/from CPU)
CAN
Module 1
CAN
Module 2
CAN
Memory
FCTXD1 FCRXD1
FCTXD2 FCRXD2
CAN
Module 3
FCTXD3 FCRXD3
Note
Memory
Access
Controller
CAN
Module 4
FCTXD4 FCRXD4
Note
Содержание mPD703128
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