P60, P61 (Port 6); P81 To P87 (Port 8) - NEC mPD780973 Series Preliminary User's Manual

(c) SCK
Serial interface serial clock input/output pin.
(d) RxD, TxD
Asynchronous serial interface serial data input/output pins.

2.2.7 P60, P61 (Port 6)

These pins constitute a 2-bit input/output port. In addition, they also function as clock output and sound generator
output pins.
The following operating modes can be specified bit-wise.
(1) Port mode
In this mode, P60 and P61 function as a 2-bit input/output port. They can be set bit-wise in the input or output
mode by using port mode register 6 (PM6).
(2) Control mode
In this mode, P60 and P61 function as clock output and sound generator output pins.
(a) PCL
Clock output pin.
(b) SGOF
Sound generator (without amplitude) signal output pin.
(c) SGO
Sound generator (with amplitude) signal output pin.
(d) SGOA
Sound generator amplitude signal output pin.

2.2.8 P81 to P87 (Port 8)

These pins constitute a 7-bit input/output port. In addition, they also function as output pins for segment signals
from the internal LCD controller/driver, and one of them as a prescaler signal output pin.
The following operating modes can be specified bit-wise.
(1) Port mode
In this mode, P81 to P87 function as a 7-bit input/output port. They can be set bit-wise in the input or output
mode by using port mode register 8 (PM8).
(2) Control mode
In this mode, P81 to P87 function as segment signal output pins of the LCD controller/driver, and one of them
as a prescaler signal output pins.
(a) S13 to S19
Segment signal output pins of the LCD controller/driver.
(b) TPO
Prescaler signal output pin of the 16-bit timer.
CHAPTER 2 PIN FUNCTION
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