UPD78044F datasheet(41/472 Pages) NEC

41 / 472 page

Chapter 2

Pin Function (µPD780828A Subseries)

User’s Manual U16504EE1V1UD00

2.3.6 P50 to P57 (Port 5)

These pins constitute an 8-bit output only port. In addition they also function as PWM output pins to

control meters.

(1)

Port mode

In this mode, P50 to P57 function as an 8-bit output only port.

(2)

Control mode

In this mode, P50 to P57 function as PWM output pins (SM31 to SM34 and SM41 to SM44) for

meter control.

2.3.7 P60 to P65 (Port 6)

These are 6-bit input/output ports. Beside serving as input/output ports, they function as timer input,

clock output, sound generator output and as input/output of the asynchronous serial interface.

The following operating modes can be specified bit-wise.

(1)

Port mode

These ports function as 5-bit input/output ports. They can be specified bit-wise as input or output

ports with port mode register 3.

(2)

Control mode

These ports function as timer input, clock output, as input/output of the asynchronous serial inter-

face and sound generator output.

(a) TI20, TI21

Pins for external capture trigger input to the 16-bit timer capture registers of TM2.

(b) PCL

Clock output pin.

Pins for separate or composed signal output of the sound generator.

(d) (e) RXD0, TXD0

Asynchronous serial interface data input/output pins.

Caution:

When this port is used as a serial interface, the I/O function and output latches must

be set according to the function the user requires.

UPD78044F Datasheet(PDF) 41 Page - NEC