C167CS datasheet(162/517 Pages) INFINEON

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C167CS

Derivatives

Parallel Ports

User’s Manual

7-35

V2.0, 2000-07

Alternate Functions of Port 4

During external bus cycles that use segmentation (i.e. an address space above

64 KByte) a number of Port 4 pins may output the segment address lines. The number

of pins that is used for segment address output determines the external address space

which is directly accessible. The other pins of Port 4 (if any) may be used for general

purpose IO or for the CAN interface.

If segment address lines are selected, the alternate function of Port 4 may be necessary

to access e.g. external memory directly after reset. For this reason Port 4 will be

switched to this alternate function automatically.

The number of segment address lines is selected via bitfield SALSEL in register RP0H.

During an external reset register RP0H is configured according to the levels of PORT0.

Software can adjust the number of selected segment address lines via register

RSTCON.

The CAN interface(s) can use 2 or 4 pins of Port 4 to interface the CAN Module(s) to an

external transceiver. In this case the number of possible segment address lines is

reduced.

Table 7-6 summarizes the alternate functions of Port 4 depending on the number of

selected segment address lines (coded via bitfield SALSEL).

Note: Port 4 pins that are neither used for segment address output nor for the CAN

interface may be used for general purpose IO.

If more than one function is selected for a Port 4 pin, the CAN interface lines will

override general purpose IO and the segment address.

Table 7-6

Alternate Functions of Port 4

Port 4

Std. Function

SALSEL = 01

64 KB

Altern. Function

SALSEL = 11

256KB

Altern. Function

SALSEL = 00

1 MB

Altern. Function

SALSEL = 10

16 MB

P4.0

P4.1

P4.2

P4.3

P4.4

P4.5

P4.6

P4.7

Gen. purpose IO

Gen. p. IO or CAN

Seg. Address A16

Seg. Address A17

Gen. purpose IO

Gen. p. IO or CAN

Seg. Address A16

Seg. Address A17

Seg. Address A18

Seg. Address A19

Gen. p. IO or CAN

Seg. Address A16

Seg. Address A17

Seg. Address A18

Seg. Address A19

S.A. A20 or CAN

S.A. A21 or CAN

S.A. A22 or CAN

S.A. A23 or CAN

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