ST10F168 datasheet(32/74 Pages) STMICROELECTRONICS

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ST10F168

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12 - PARALLEL PORTS

The ST10F168 provides up to 111 I/O lines

organized into eight input / output ports and one

input port. All port lines are bit-addressable, and

all input / output lines are individually (bit-wise)

programmable as input or output via direction

registers. The I/O ports are true bidirectional ports

which are switched to high impedance state when

configured as inputs. The output drivers of five I/O

ports can be configured (pin by pin) for push-pull

operation or open-drain operation via control

registers. During the internal reset, all port pins

are configured as inputs.

The input threshold of Port 2, Port 3, Port 7 and

Port 8 is selectable (TTL or CMOS-like), where

the special CMOS-like input threshold reduces

noise sensitivity to the input hysteresis. The input

thresholds are selected with bit of PICON register

dedicated to blocks of 8 input pins (2-bit for Port2,

2-bit for Port3, 1-bit for Port7, 1-bit for Port8).

All pins of I/O ports also support an alternate pro-

grammable function:

– Port0 and Port1 may be used as address and

data lines when accessing external memory.

– Port 2, Port 7 and Port 8 are associated with the

capture inputs or with the compare outputs of

the CAPCOM units and / or with the outputs of

the PWM module.

– Port 3 includes the alternate functions of timers,

serial interfaces, the optional bus control signal

BHE and the system clock output (CLKOUT).

– Port 4 outputs the additional segment address

bit A16 to A23 in systems where segmentation

is enabled to access more than 64K Byte of

memory.

– Port 5 is used as analog input channels of the

A/D converter or as timer control signals.

– Port 6 provides optional bus arbitration signals

(BREQ, HLDA, HOLD) and chip select signals.

All port lines that are not used for alternate func-

tions may be used as general purpose I/O lines.

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