Port 4 (P40 - P43) - Toshiba TLCS-90 Series Data Book

8 bit microcontroller

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Port 4 (P40 - P43)

Port 4 is a 4-bit port (P4: memory address FFC8H) intended only for

All bits of the output latch are initialized to "0" by

resetting, and "0" is generated from the port.

In addition to the output port function,

it works as an address bus

(A16 - A19).

The selection of the address bus function is made by the

control register

memory address FFC9H).

The output port or

addre.ss bus function can be selected for each bit.

All bits of the

contro 1 regis ter are init ial ized to "0" by reset t ing,

by wh ich the

port turns to the output mode.

Fig. 3.5 (8)

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