ST10F280 datasheet(12/186 Pages) STMICROELECTRONICS

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ST10F280

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J14

External Memory Read Strobe. RD is activated for every external instruction or

data read access.

WR/WRL

J15

External Memory Write Strobe. In WR-mode this pin is activated for every

external data write access. In WRL-mode this pin is activated for low byte data

write accesses on a 16-bit bus, and for every data write access on an 8-bit bus.

See WRCFG in register SYSCON for mode selection.

READY/

READY

J16

Ready Input. The active level is programmable. When the Ready function is

enabled, the selected inactive level at this pin during an external memory access

will force the insertion of memory cycle time waitstates until the pin returns to the

selected active level.

ALE

J17

Address Latch Enable Output. Can be used for latching the address into external

memory or an address latch in the multiplexed bus modes.

H17

External Access Enable pin. A low level at this pin during and after Reset forces

the ST10F280 to begin instruction execution out of external memory. A high level

forces execution out of the internal Flash Memory.

PORT0:

P0L.0 - P0L.7,

P0H.0 - P0H.7

I/O

PORT0 consists of the two 8-bit bidirectional I/O ports P0L and P0H. It is bit-wise

programmable for input or output via direction bits. For a pin configured as input,

the output driver is put into high-impedance state.

In case of an external bus configuration, PORT0 serves as the address (A) and

address/data (AD) bus in multiplexed bus modes and as the data (D) bus in

demultiplexed bus modes.

Demultiplexed bus modes:

Data Path Width:

8-bit

16-bit

P0L.0 – P0L.7:

D0 - D7

P0H.0 – P0H.7:

I/O

D8 - D15

Multiplexed bus modes:

Data Path Width:

8-bit

16-bit

P0L.0 – P0L.7:

AD0 - AD7

P0H.0 – P0H.7:

A8 - A15

AD8 - AD15

H16

I/O

P0L.0

H15

I/O

P0L.1

H14

I/O

P0L.2

G16

I/O

P0L.3

G15

I/O

P0L.4

G14

I/O

P0L.5

F16

I/O

P0L.6

E17

I/O

P0L.7

F15

I/O

P0H.0

E16

I/O

P0H.1

F14

I/O

P0H.2

D17

I/O

P0H.3

E15

I/O

P0H.4

D16

I/O

P0H.5

C17

I/O

P0H.6

E14

I/O

P0H.7

Table 1 : Ball Description (continued)

Symbol

Ball

Number

Type

Function

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