ST10F280_12 datasheet(116/239 Pages) STMICROELECTRONICS

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Parallel ports

ST10F280

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Doc ID 8673 Rev. 3

DP4

Address:

0xFFCAh / E5h SFR

Reset:

0x--00h

Type:

R/W

For CAN configuration support (see Chapter 15: CAN modules), Port 4 has a new open

drain function, controlled with the new ODP4 register:

ODP4

Address:

0xF1CAh / E5h ESFR

Reset:

0x--00h

Type:

R/W

Note:

Only bits 6 and 7 are implemented, all other bits will be read as “0”.

12.6.1

Alternate functions of Port 4

During external bus cycles that use segmentation (i.e. an address space above 64K Bytes)

a number of Port 4 pins may output the segment address lines. The number of pins used for

segment address output determines the directly accessible external address space.

The other pins of Port 4 may be used for general purpose I/O. 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 PORT0 during reset. The selected

value can be read from bitfield SALSEL in register RP0H (read only) to check the

configuration during run time.

---

DP4.7 DP4.6 DP4.5 DP4.4 DP4.3 DP4.2 DP4.1 DP4.0

R/W

DP4.y Port direction register DP4 bit y

DP4.y = 0: Port line P4.y is an input (high-impedance)

DP4.y = 1: Port line P4.y is an output

---

ODP4.7

ODP4.6

---

R/W

ODP4.y Port 4 Open drain control register bit y

ODP4.y = 0: Port line P4.y output driver in push/pull mode

ODP4.y = 1: Port line P4.y output driver in open drain mode if P4.y is not a segment

address line output

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