Detailed descriptions
16.4 I/O Address Areas
SIMATIC IPC427C
Operating Instructions, 04/2009, A5E02414743-01
139
16.4.4
CAN base address register (write only, address 066h)
A 512 byte window is created in the I/O area for the CAN controller (Philips SJA1000). The
block itself only needs 32 or 128 bytes of this depending on the operating mode. The
address window can be selected in 1024 byte steps between 4000h and 7C00h through the
CAN base address register (write only, address 066h).
A limited selection can be preset in the BIOS Setup.
Note
The CAN base address register shares its I/O address with other registers. The watchdog
enable register / 066h select register therefore must be selected before access.
Meaning of the bits
CAN base address register (write only, address 066h, Address register selection 1)
Bit
Description
7 6 5 4 3 2 1 0
0 0 Reserved (Write: 00)
0 1
Reserved (Write:01)
0 0 0 0
40h
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1 1 1 1
7Ch
Sets the high byte of the CAN base address
01nnnn00
