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C167CS-4R

C167CS-L

Data Sheet

V2.2, 2001-08

Parallel Ports

The C167CS provides up to 111 I/O lines which are 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 inputs or outputs 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 due to the input

hysteresis. The input threshold may be selected individually for each byte of the

respective ports.

All port lines have programmable alternate input or output functions associated with

them. All port lines that are not used for these alternate functions may be used as general

purpose IO lines.

PORT0 and PORT1 may be used as address and data lines when accessing external

memory, while Port 4 outputs the additional segment address bits A23/19/17 … A16 in

systems where segmentation is enabled to access more than 64 KBytes of memory.

Port 2, Port 8 and Port 7 (and parts of PORT1) are associated with the capture inputs or

compare outputs of the CAPCOM units and/or with the outputs of the PWM module.

Port 6 provides optional bus arbitration signals (BREQ, HLDA, HOLD) and chip select

signals.

Port 3 includes alternate functions of timers, serial interfaces, the optional bus control

signal BHE/WRH, and the system clock output CLKOUT (or the programmable

frequency output FOUT).

Port 5 (and parts of PORT1) is used for the analog input channels to the A/D converter

or timer control signals.

The edge characteristics (transition time) and driver characteristics (output current) of

the C167CS’s port drivers can be selected via the Port Output Control registers

(POCONx).

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