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DCAN Registers
23.4.55 TIOC Register (offset = 1E0h) [reset = 0h]
TIOC is shown in Figure 23-73 and described in Table 23-68.
The CAN_TX pin of the DCAN module can be used as general purpose IO pin if CAN function is not
needed. The values of the IO control registers are only writable if Init bit of the CAN control register is set.
The OD, Func, Dir and Out bits of the CAN TX IO control register are forced to certain values when Init bit
of CAN control register is reset (see bit descriptions).
Figure 23-73. TIOC Register
31 30 29 28 27 26 25 24
Reserved
R-0h
23 22 21 20 19 18 17 16
Reserved PU PD OD
R-0h R/W-0h R/W-0h R/WP-0h
15 14 13 12 11 10 9 8
Reserved
R-0h
7 6 5 4 3 2 1 0
Reserved Func Dir Out In
R-0h R/WP-0h R/WP-0h R/WP-0h R-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 23-68. TIOC Register Field Descriptions
Bit Field Type Reset Description
31-19 Reserved R 0h
18 PU R/W 0h CAN_TX pull up/pull down select.
This bit is only active when CAN_TX is configured to be an input.
0x0 = CAN_TX pull down is selected, when pull logic is active (PD =
0).
0x1 = CAN_TX pull up is selected, when pull logic is active (PD = 0).
17 PD R/W 0h CAN_TX pull disable.
This bit is only active when CAN_TX is configured to be an input.
0x0 = CAN_TX pull is active
0x1 = CAN_TX pull is disabled
16 OD R/WP 0h CAN_TX open drain enable.
This bit is only active when CAN_TX is configured to be in GIO
mode (TIOC.Func=0).
Forced to '0' if Init bit of CAN control register is reset.
0x0 = The CAN_TX pin is configured in push/pull mode.
0x1 = The CAN_TX pin is configured in open drain mode.
15-4 Reserved R 0h
3 Func R/WP 0h CAN_TX function.
This bit changes the function of the CAN_TX pin.
Forced to '1' if Init bit of CAN control register is reset.
0x0 = CAN_TX pin is in GIO mode.
0x1 = CAN_TX pin is in functional mode (as an output to transmit
CAN data).
2 Dir R/WP 0h CAN_TX data direction.
This bit controls the direction of the CAN_TX pin when it is
configured to be in GIO mode only (TIOC.Func=0).
Forced to '1' if Init bit of CAN control register is reset.
0x0 = The CAN_TX pin is an input.
0x1 = The CAN_TX pin is an output
3989
SPRUH73H–October 2011–Revised April 2013 Controller Area Network (CAN)
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